diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..06c9c83
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,16 @@
+.git
+.venv
+__pycache__
+*.pyc
+.pytest_cache
+htmlcov
+.coverage
+data
+logs
+*.log
+.env
+.env.local
+docker-compose.override.yml
+frontend/node_modules
+frontend/dist
+app/static/admin
diff --git a/.gitignore b/.gitignore
index 056168c..5cf2009 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,9 @@ dist/
 build/
 .venv/
 
+# Frontend
+node_modules/
+
 # Env
 .env
 .env.local
diff --git a/Dockerfile b/Dockerfile
index 371ba2f..354dd7d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,3 +1,17 @@
+# ---------- Stage 1: 前端构建 ----------
+FROM node:20-slim AS frontend-builder
+
+WORKDIR /frontend
+
+# 依赖层（利用 Docker 层缓存）
+COPY frontend/package.json frontend/package-lock.json ./
+RUN npm ci
+
+# 源码 + 构建
+COPY frontend/ ./
+RUN npm run build
+
+# ---------- Stage 2: Python 后端 ----------
 FROM python:3.12-slim AS base
 
 WORKDIR /app
@@ -13,6 +27,9 @@ RUN uv sync --frozen --no-dev
 COPY app/ app/
 COPY scripts/ scripts/
 
+# 前端构建产物 → 后端静态目录（SPA 由 /admin 路由服务）
+COPY --from=frontend-builder /frontend/dist /app/app/static/admin
+
 EXPOSE 8000
 
 HEALTHCHECK --interval=30s --timeout=5s --retries=3 \
diff --git a/app/api/v1/settings.py b/app/api/v1/settings.py
new file mode 100644
index 0000000..cf9728e
--- /dev/null
+++ b/app/api/v1/settings.py
@@ -0,0 +1,114 @@
+"""运行时配置 API：GET/PUT /api/v1/settings、GET /api/v1/settings/schema、POST /api/v1/settings/reset
+
+GET 任何登录用户可读；PUT/reset 需 admin。PUT 后会清空 LLM 客户端 / 解析插件 /
+去重策略三处进程级缓存，使新配置立即对后续请求生效。
+"""
+
+from typing import Any
+
+import structlog
+from fastapi import APIRouter, Depends
+from pydantic import BaseModel
+
+from app.api.response import ApiError, ok
+from app.core.auth import AuthUser, get_current_user, require_admin
+from app.core.dedup import invalidate_dedup_strategy_cache
+from app.core.file_parser import (
+    list_docx_plugins,
+    list_ocr_plugins,
+    list_pdf_plugins,
+    invalidate_parser_plugin_cache,
+)
+from app.core.runtime_settings import (
+    RuntimeSettings,
+    get_runtime_settings,
+    reset_runtime_settings,
+    update_runtime_settings,
+)
+from app.services.llm import invalidate_llm_client_cache
+
+logger = structlog.get_logger()
+
+router = APIRouter(prefix="/api/v1", tags=["settings"])
+
+
+class SettingsUpdateRequest(BaseModel):
+    """Settings PATCH body：任意子树可缺省，缺省字段保留原值
+
+    例：{"models": {"summarize": {"model": "qwen2.5:3b"}}}、
+        {"parsers": {"ocr": {"plugin": "tesseract"}}}、
+        {"dedup": {"strategy": "simhash", "simhash_threshold": 5}}
+    """
+
+    models: dict[str, Any] | None = None
+    parsers: dict[str, Any] | None = None
+    dedup: dict[str, Any] | None = None
+
+
+@router.get("/settings")
+async def get_settings(user: AuthUser = Depends(get_current_user)) -> dict[str, Any]:
+    """返回当前 RuntimeSettings（任何登录用户可读）"""
+    cfg = get_runtime_settings()
+    return ok(cfg.model_dump(mode="json"))
+
+
+@router.put("/settings")
+async def update_settings(
+    body: SettingsUpdateRequest,
+    user: AuthUser = Depends(require_admin),
+) -> dict[str, Any]:
+    """部分更新 RuntimeSettings（仅 admin）
+
+    更新成功后清空 LLM 客户端 / 解析插件 / 去重策略三处进程级缓存，
+    使新配置立即对后续请求生效。
+    """
+    patch = body.model_dump(exclude_none=True)
+    if not patch:
+        raise ApiError(1001, "请求体为空，未提供任何待更新字段")
+
+    try:
+        cfg = update_runtime_settings(patch)
+    except Exception as exc:
+        logger.error("RuntimeSettings 更新失败", error=str(exc), exc_info=True)
+        raise ApiError(2000, f"配置更新失败: {exc}") from exc
+
+    # 清缓存：让后续读取拿到新配置
+    invalidate_llm_client_cache()
+    invalidate_parser_plugin_cache()
+    invalidate_dedup_strategy_cache()
+    logger.info("RuntimeSettings 已更新并清理缓存", operator=user.username)
+    return ok(cfg.model_dump(mode="json"))
+
+
+@router.get("/settings/schema")
+async def get_settings_schema(
+    user: AuthUser = Depends(get_current_user),
+) -> dict[str, Any]:
+    """返回可选插件与策略列表（前端 Settings 页渲染选项用）"""
+    return ok(
+        {
+            "llm_providers": ["ollama", "openai_compatible"],
+            "pdf_plugins": list_pdf_plugins(),
+            "docx_plugins": list_docx_plugins(),
+            "ocr_plugins": list_ocr_plugins(),
+            "dedup_strategies": ["none", "sha256", "simhash"],
+        }
+    )
+
+
+@router.post("/settings/reset")
+async def reset_settings(
+    user: AuthUser = Depends(require_admin),
+) -> dict[str, Any]:
+    """重置 RuntimeSettings 为默认值（仅 admin），同时清缓存"""
+    try:
+        cfg = reset_runtime_settings()
+    except Exception as exc:
+        logger.error("RuntimeSettings 重置失败", error=str(exc), exc_info=True)
+        raise ApiError(2000, f"配置重置失败: {exc}") from exc
+
+    invalidate_llm_client_cache()
+    invalidate_parser_plugin_cache()
+    invalidate_dedup_strategy_cache()
+    logger.info("RuntimeSettings 已重置为默认值", operator=user.username)
+    return ok(cfg.model_dump(mode="json"))
diff --git a/app/config.py b/app/config.py
index b8ad1a3..9b1a7fd 100644
--- a/app/config.py
+++ b/app/config.py
@@ -9,11 +9,12 @@ class Settings(BaseSettings):
     log_level: str = "info"
 
     # 嵌入模型
-    embedding_provider: str = "openai"  # openai | local
+    embedding_provider: str = "local"  # openai | local
     openai_api_key: str = ""
     openai_base_url: str = "https://api.openai.com/v1"
     embedding_model: str = "text-embedding-3-small"
-    embedding_dimension: int = 1536
+    # bge-m3（本地 Ollama 嵌入）维度为 1024；切换 openai provider 时需同步改为 1536
+    embedding_dimension: int = 1024
 
     # Ollama 本地模型（用于文档三级总结）
     ollama_base_url: str = "http://localhost:11434"
diff --git a/app/core/classifier.py b/app/core/classifier.py
index a15972e..9f1a82f 100644
--- a/app/core/classifier.py
+++ b/app/core/classifier.py
@@ -1,6 +1,7 @@
 """文档分类器
 
-入库链路第二步：基于 L1 总结，用 Ollama 小模型将文档判定为 taxonomy 中的
+入库链路第二步：基于 L1 总结，用 LLM（Ollama 或 OpenAI 兼容服务，由
+runtime_settings.models.classify 决定）将文档判定为 taxonomy 中的
 主类目 + 附加标签：
 - LLM 输出解析失败 / 类目名不在 taxonomy → 归 uncategorized（confidence=0.0）
 - 置信度低于阈值 → 主类目归 uncategorized，候选类目名保留进 tags（软召回用）
@@ -13,7 +14,7 @@ import structlog
 
 from app.config import settings
 from app.models.knowledge import UNCATEGORIZED, CategoryResult, TaxonomyCategory, load_taxonomy
-from app.services.ollama import OllamaClient
+from app.services.llm import LLMClient, create_llm_client
 
 logger = structlog.get_logger()
 
@@ -47,8 +48,10 @@ def _extract_json(raw: str) -> dict | None:
 class Classifier:
     """文档分类器：将 L1 总结判定为 taxonomy 主类目 + 附加标签"""
 
-    def __init__(self, ollama: OllamaClient | None = None, taxonomy: list[TaxonomyCategory] | None = None) -> None:
-        self.ollama = ollama or OllamaClient()
+    def __init__(self, ollama: LLMClient | None = None, taxonomy: list[TaxonomyCategory] | None = None) -> None:
+        # 默认按 runtime_settings.models.classify 选择 LLM 实现；
+        # 测试可通过 ollama 参数注入替身。
+        self.ollama = ollama or create_llm_client("classify")
         self.taxonomy = taxonomy if taxonomy is not None else load_taxonomy()
         # 合法类目名集合（含 uncategorized）
         self._valid_names = {c.name for c in self.taxonomy}
diff --git a/app/core/dedup.py b/app/core/dedup.py
new file mode 100644
index 0000000..33beba0
--- /dev/null
+++ b/app/core/dedup.py
@@ -0,0 +1,216 @@
+"""文本去重策略工厂
+
+支持三种策略：
+- none：关闭去重，每次都跑完整流水线
+- sha256：精确匹配（hash 完全相同才算重复）
+- simhash：近似匹配（海明距离 <= 阈值视为重复）
+
+每种策略实现 DedupStrategy 协议：lookup(text) -> dict|None、record(text, result) -> None。
+工厂 get_dedup_strategy() 根据 runtime_settings.dedup 选择实现。
+所有策略共享同一 Redis key 前缀，但 key 后缀按策略区分避免冲突。
+"""
+
+from __future__ import annotations
+
+import hashlib
+from typing import Any, Protocol, runtime_checkable
+
+import structlog
+
+from app.core.runtime_settings import get_runtime_settings
+from app.services.redis import RedisCache
+
+logger = structlog.get_logger()
+
+# Redis 去重 key 前缀，按策略分桶
+_DEDUP_KEY_PREFIX = "dedup:"
+
+
+@runtime_checkable
+class DedupStrategy(Protocol):
+    """去重策略协议"""
+
+    async def lookup(self, text: str) -> dict[str, Any] | None:
+        """查询文本是否已入库；命中返回旧 IngestionResult（dict），未命中返回 None"""
+        ...
+
+    async def record(self, text: str, result_dict: dict[str, Any]) -> None:
+        """记录文本已入库，供后续命中复用"""
+        ...
+
+
+class NoopDedupStrategy:
+    """关闭去重：永远不命中，也不记录"""
+
+    async def lookup(self, text: str) -> dict[str, Any] | None:
+        return None
+
+    async def record(self, text: str, result_dict: dict[str, Any]) -> None:
+        return None
+
+
+class Sha256DedupStrategy:
+    """SHA256 精确去重：完全相同文本才算重复"""
+
+    def __init__(self, redis: RedisCache, ttl_seconds: int) -> None:
+        self._redis = redis
+        self._ttl = ttl_seconds
+
+    def _key(self, text: str) -> str:
+        h = hashlib.sha256(text.encode("utf-8")).hexdigest()
+        return f"{_DEDUP_KEY_PREFIX}sha256:{h}"
+
+    async def lookup(self, text: str) -> dict[str, Any] | None:
+        try:
+            return await self._redis.get_json(self._key(text))
+        except Exception:
+            logger.warning("sha256 去重查询失败，降级未命中", exc_info=True)
+            return None
+
+    async def record(self, text: str, result_dict: dict[str, Any]) -> None:
+        try:
+            await self._redis.set_json(self._key(text), result_dict, ttl=self._ttl)
+        except Exception:
+            logger.warning("sha256 去重记录写入失败", exc_info=True)
+
+
+# SimHash 实现（64 位）
+_MASK_64 = (1 << 64) - 1
+
+
+def _simhash(text: str, token_size: int = 4) -> int:
+    """计算文本 64 位 simhash
+
+    简化实现：按 token_size 字符滑窗分词，每段 md5 → 128 位 → 取低 64 位作为 hash，
+    逐位加权（hash 该位为 1 则 +1，为 0 则 -1），最终符号位定 1/0。
+    """
+    if not text:
+        return 0
+    tokens = [text[i : i + token_size] for i in range(0, len(text), token_size)]
+    weights = [1] * 64
+    vec = [0] * 64
+    for token in tokens:
+        h = int(hashlib.md5(token.encode("utf-8")).hexdigest(), 16) & _MASK_64
+        for i in range(64):
+            bit = (h >> i) & 1
+            vec[i] += weights[i] if bit else -weights[i]
+    fingerprint = 0
+    for i in range(64):
+        if vec[i] > 0:
+            fingerprint |= (1 << i)
+    return fingerprint
+
+
+def _hamming_distance(a: int, b: int) -> int:
+    return bin((a ^ b) & _MASK_64).count("1")
+
+
+class SimhashDedupStrategy:
+    """SimHash 近似去重：海明距离 <= 阈值视为重复
+
+    Redis 中存所有已入库文本的 simhash（value 为 IngestionResult + simhash）。
+    lookup 时遍历所有候选 simhash 算海明距离，找最近的一个 <= 阈值则命中。
+    注：本实现为简化版，全表扫描，适合中小规模知识库；超大规模需换 LSH 索引。
+    """
+
+    INDEX_KEY = f"{_DEDUP_KEY_PREFIX}simhash:index"  # list 形式存所有 simhash+key
+
+    def __init__(self, redis: RedisCache, ttl_seconds: int, threshold: int = 3) -> None:
+        self._redis = redis
+        self._ttl = ttl_seconds
+        self._threshold = max(0, min(64, threshold))
+
+    async def lookup(self, text: str) -> dict[str, Any] | None:
+        try:
+            fingerprint = _simhash(text)
+            # 简化：扫描所有 simhash 记录找最近的
+            # 用 set:dedup:simhash:fps 存所有 fingerprint，每个 fp 对应一个 record key
+            # 这里用 list key 简化（适合小规模）
+            index = await self._redis.get_json(self.INDEX_KEY) or {"entries": []}
+            entries = index.get("entries", [])
+            best_dist = self._threshold + 1
+            best_key: str | None = None
+            for entry in entries:
+                fp = entry.get("fingerprint")
+                key = entry.get("key")
+                if fp is None or key is None:
+                    continue
+                dist = _hamming_distance(fingerprint, int(fp))
+                if dist <= self._threshold and dist < best_dist:
+                    best_dist = dist
+                    best_key = key
+            if best_key is None:
+                return None
+            return await self._redis.get_json(best_key)
+        except Exception:
+            logger.warning("simhash 去重查询失败，降级未命中", exc_info=True)
+            return None
+
+    async def record(self, text: str, result_dict: dict[str, Any]) -> None:
+        try:
+            fingerprint = _simhash(text)
+            key = f"{_DEDUP_KEY_PREFIX}simhash:{fingerprint:016x}"
+            # 1. 写记录
+            await self._redis.set_json(key, result_dict, ttl=self._ttl)
+            # 2. 更新索引
+            index = await self._redis.get_json(self.INDEX_KEY) or {"entries": []}
+            entries = index.get("entries", [])
+            entries.append({"fingerprint": fingerprint, "key": key})
+            await self._redis.set_json(self.INDEX_KEY, {"entries": entries}, ttl=self._ttl)
+        except Exception:
+            logger.warning("simhash 去重记录写入失败", exc_info=True)
+
+
+# ---------------------------------------------------------------------------- #
+# 工厂
+# ---------------------------------------------------------------------------- #
+
+_strategy_cache: DedupStrategy | None = None
+_strategy_signature: tuple[str, int, int] | None = None  # (strategy, ttl, threshold)
+
+
+def get_dedup_strategy(redis: RedisCache | None) -> DedupStrategy:
+    """按 runtime_settings.dedup 构造去重策略
+
+    Redis 不可用时降级为 NoopDedupStrategy（关闭去重），不影响主流程。
+    策略配置变更时自动重建单例。
+    """
+    global _strategy_cache, _strategy_signature
+
+    rt = get_runtime_settings()
+    sig = (rt.dedup.strategy, rt.dedup.ttl_seconds, rt.dedup.simhash_threshold)
+
+    if _strategy_cache is not None and _strategy_signature == sig:
+        return _strategy_cache
+
+    if redis is None or rt.dedup.strategy == "none":
+        strategy: DedupStrategy = NoopDedupStrategy()
+    elif rt.dedup.strategy == "sha256":
+        strategy = Sha256DedupStrategy(redis=redis, ttl_seconds=rt.dedup.ttl_seconds)
+    elif rt.dedup.strategy == "simhash":
+        strategy = SimhashDedupStrategy(
+            redis=redis, ttl_seconds=rt.dedup.ttl_seconds, threshold=rt.dedup.simhash_threshold
+        )
+    else:
+        logger.warning("未知去重策略，降级为 noop", requested=rt.dedup.strategy)
+        strategy = NoopDedupStrategy()
+
+    _strategy_cache = strategy
+    _strategy_signature = sig
+    return strategy
+
+
+def invalidate_dedup_strategy_cache() -> None:
+    """清除策略缓存（runtime_settings 更新后调用）"""
+    global _strategy_cache, _strategy_signature
+    _strategy_cache = None
+    _strategy_signature = None
+
+
+def compute_text_hash(text: str) -> str:
+    """计算文本哈希（兼容旧接口，sha256 策略下与 dedup key 一致）"""
+    return hashlib.sha256(text.encode("utf-8")).hexdigest()
+
+
+# 兼容旧测试与外部引用：保留 DEDUP_KEY_PREFIX 导出
+DEDUP_KEY_PREFIX = _DEDUP_KEY_PREFIX
diff --git a/app/core/file_parser.py b/app/core/file_parser.py
index 1d71ef0..fc18018 100644
--- a/app/core/file_parser.py
+++ b/app/core/file_parser.py
@@ -1,14 +1,19 @@
-"""多格式文件文本提取：按扩展名分发到对应解析器
+"""多格式文件文本提取：按扩展名分发到对应解析器（插件化）
 
 支持的扩展名：
 - .txt / .md：UTF-8 解码（errors="replace" 兜底）
 - .html / .htm：标准库 html.parser 剥离标签提取可见文本
-- .pdf：pypdf 逐页 extract_text 拼接；文本层为空（扫描件/图片型）时
-        自动降级为 OCR（pypdfium2 渲染 + rapidocr-onnxruntime 识别）
-- .docx：python-docx 段落文本拼接（不含表格/页眉页脚）
+- .pdf：PDF 文本层提取插件（默认 pypdf）；文本层为空（扫描件）时降级到 OCR 插件
+- .docx：DOCX 解析插件（默认 python-docx）
+
+插件化设计：
+- PdfTextExtractor / DocxParser / OcrEngine 三个 Protocol
+- 每种插件类型有注册表 + 默认实现 + 工厂
+- 工厂根据 runtime_settings.parsers 选择具体插件
+- 未注册或依赖缺失时降级到默认插件并告警
 
 未识别扩展名抛 ValueError("不支持的文件类型: {ext}")；
-解析异常统一包装为 ValueError("文件解析失败: {detail}")，原异常链式保留。
+解析异常统一包装为 ValueError("文件解析失败: {detail}")。
 """
 
 from __future__ import annotations
@@ -17,17 +22,19 @@ import io
 from collections.abc import Callable
 from html.parser import HTMLParser
 from pathlib import Path
-from typing import Any
+from typing import Any, Protocol, runtime_checkable
 
 import structlog
 
 from app.config import settings
+from app.core.runtime_settings import get_runtime_settings
 
 logger = structlog.get_logger()
 
-# 模块级懒加载 OCR 引擎单例（首次调用时初始化，避免无扫描件场景白白下载模型）
-_ocr_engine: Any | None = None
-_ocr_unavailable: bool = False  # 标记 OCR 依赖不可用，后续直接跳过避免重复尝试
+
+# ---------------------------------------------------------------------------- #
+# HTML / Text 解析（无插件化需求，保留原实现）
+# ---------------------------------------------------------------------------- #
 
 
 class _VisibleTextExtractor(HTMLParser):
@@ -51,13 +58,11 @@ class _VisibleTextExtractor(HTMLParser):
             self._parts.append(data)
 
     def get_text(self) -> str:
-        # 块级标签间用空格连接，再折叠多余空白
         text = " ".join(self._parts)
         return " ".join(text.split())
 
 
 def _decode_html(content: bytes) -> str:
-    """HTML 内容解码：优先 utf-8（带 BOM），失败回退 latin-1"""
     try:
         return content.decode("utf-8-sig")
     except UnicodeDecodeError:
@@ -65,108 +70,362 @@ def _decode_html(content: bytes) -> str:
 
 
 def _parse_text(content: bytes) -> str:
-    """UTF-8 解码（errors=replace 兜底），保留原字符"""
     return content.decode("utf-8", errors="replace")
 
 
 def _parse_html(content: bytes) -> str:
-    """HTML 剥离标签，保留可见文本"""
     parser = _VisibleTextExtractor()
     parser.feed(_decode_html(content))
     parser.close()
     return parser.get_text()
 
 
-def _parse_pdf(content: bytes) -> str:
-    """PDF 解析：优先 pypdf extract_text；文本层为空（扫描件）时降级 OCR
+# ---------------------------------------------------------------------------- #
+# 插件协议
+# ---------------------------------------------------------------------------- #
 
-    OCR 流程：pypdfium2 渲染每页为 PIL Image → rapidocr-onnxruntime 识别 →
-    拼接每页识别出的文本。受 settings.pdf_ocr_* 控制：开关、最大页数、DPI。
-    OCR 依赖未安装或运行异常时降级返回空字符串（由上游 upload 端点拒绝入库）。
+
+@runtime_checkable
+class PdfTextExtractor(Protocol):
+    """PDF 文本层提取插件协议"""
+
+    def extract_text(self, content: bytes) -> str:
+        """从 PDF 二进制内容提取文本层；无文本层返回空字符串"""
+        ...
+
+
+@runtime_checkable
+class DocxParser(Protocol):
+    """DOCX 解析插件协议"""
+
+    def extract_text(self, content: bytes) -> str:
+        """从 DOCX 二进制内容提取段落文本"""
+        ...
+
+
+@runtime_checkable
+class OcrEngine(Protocol):
+    """OCR 引擎插件协议"""
+
+    def ocr_pdf(self, content: bytes, *, max_pages: int, dpi: int) -> str:
+        """对 PDF 跑 OCR，返回识别文本；失败返回空字符串"""
+        ...
+
+
+# ---------------------------------------------------------------------------- #
+# 默认 PDF 插件：pypdf
+# ---------------------------------------------------------------------------- #
+
+
+class PypdfTextExtractor:
+    """pypdf 文本层提取（默认）"""
+
+    def extract_text(self, content: bytes) -> str:
+        from pypdf import PdfReader
+
+        reader = PdfReader(io.BytesIO(content))
+        parts: list[str] = []
+        for page in reader.pages:
+            text = page.extract_text() or ""
+            if text:
+                parts.append(text)
+        return "\n".join(parts).strip()
+
+
+# ---------------------------------------------------------------------------- #
+# 备选 PDF 插件：pdfplumber（lazy import，依赖缺失时不可用）
+# ---------------------------------------------------------------------------- #
+
+
+class PdfplumberTextExtractor:
+    """pdfplumber 文本层提取（备选，对复杂排版更友好）"""
+
+    def extract_text(self, content: bytes) -> str:
+        import pdfplumber  # type: ignore[import-untyped]
+
+        parts: list[str] = []
+        with pdfplumber.open(io.BytesIO(content)) as pdf:
+            for page in pdf.pages:
+                text = page.extract_text() or ""
+                if text:
+                    parts.append(text)
+        return "\n".join(parts).strip()
+
+
+# ---------------------------------------------------------------------------- #
+# 默认 DOCX 插件：python-docx
+# ---------------------------------------------------------------------------- #
+
+
+class PythonDocxParser:
+    """python-docx 段落提取（默认）"""
+
+    def extract_text(self, content: bytes) -> str:
+        from docx import Document  # type: ignore[import-untyped]
+
+        document = Document(io.BytesIO(content))
+        parts = [p.text for p in document.paragraphs if p.text and p.text.strip()]
+        return "\n".join(parts).strip()
+
+
+# ---------------------------------------------------------------------------- #
+# 默认 OCR 插件：rapidocr-onnxruntime + pypdfium2
+# ---------------------------------------------------------------------------- #
+
+
+class RapidocrOcrEngine:
+    """rapidocr-onnxruntime OCR 引擎（默认）
+
+    流程：pypdfium2 渲染每页为 PIL Image → rapidocr 识别 → 拼接。
+    类级懒加载单例（_engine/_unavailable 为类属性，跨实例共享），
+    依赖缺失时降级返回空文本。
     """
-    from pypdf import PdfReader
 
-    reader = PdfReader(io.BytesIO(content))
-    parts: list[str] = []
-    for page in reader.pages:
-        text = page.extract_text() or ""
-        if text:
-            parts.append(text)
-    text_layer = "\n".join(parts).strip()
+    _engine: Any | None = None
+    _unavailable: bool = False
+
+    def ocr_pdf(self, content: bytes, *, max_pages: int, dpi: int) -> str:
+        if self._unavailable:
+            return ""
+
+        # 1. 懒加载 OCR 引擎（类级单例，跨实例共享）
+        if self._engine is None:
+            try:
+                from rapidocr_onnxruntime import RapidOCR
+
+                RapidocrOcrEngine._engine = RapidOCR()
+                logger.info("PDF OCR 引擎已初始化", dpi=dpi)
+            except Exception:
+                RapidocrOcrEngine._unavailable = True
+                logger.warning(
+                    "OCR 依赖不可用，扫描件 PDF 将无法提取文本", exc_info=True
+                )
+                return ""
+
+        # 2. 渲染并识别
+        try:
+            import pypdfium2 as pdfium
+
+            scale = max(1.0, dpi / 72.0)
+            pdf = pdfium.PdfDocument(io.BytesIO(content))
+            total = min(len(pdf), max(1, max_pages))
+            page_texts: list[str] = []
+            for i in range(total):
+                page = pdf[i]
+                pil_image = page.render(scale=scale).to_pil()
+                result, _ = self._engine(pil_image)
+                if result:
+                    lines = [
+                        item[1]
+                        for item in result
+                        if item and len(item) >= 2 and item[1]
+                    ]
+                    if lines:
+                        page_texts.append("\n".join(lines))
+            pdf.close()
+            return "\n".join(page_texts).strip()
+        except Exception as exc:
+            logger.warning(
+                "PDF OCR 失败，降级返回空文本", error=str(exc), exc_info=True
+            )
+            return ""
+
+
+# ---------------------------------------------------------------------------- #
+# 备选 OCR 插件：tesseract（lazy import，依赖缺失时不可用）
+# ---------------------------------------------------------------------------- #
+
+
+class TesseractOcrEngine:
+    """pytesseract + pdfium OCR（备选）
+
+    需要系统安装 tesseract 二进制与语言包。
+    类级 _unavailable 单例，跨实例共享。
+    """
+
+    _unavailable: bool = False
+
+    def ocr_pdf(self, content: bytes, *, max_pages: int, dpi: int) -> str:
+        if self._unavailable:
+            return ""
+        try:
+            import pypdfium2 as pdfium
+            import pytesseract  # type: ignore[import-untyped]
+            from PIL import Image  # type: ignore[import-untyped]
+        except Exception:
+            TesseractOcrEngine._unavailable = True
+            logger.warning("tesseract 依赖不可用，降级返回空文本", exc_info=True)
+            return ""
+
+        try:
+            scale = max(1.0, dpi / 72.0)
+            pdf = pdfium.PdfDocument(io.BytesIO(content))
+            total = min(len(pdf), max(1, max_pages))
+            page_texts: list[str] = []
+            for i in range(total):
+                page = pdf[i]
+                pil_image = page.render(scale=scale).to_pil()
+                text = pytesseract.image_to_string(pil_image, lang="chi_sim+eng")
+                if text:
+                    page_texts.append(text)
+            pdf.close()
+            return "\n".join(page_texts).strip()
+        except Exception as exc:
+            logger.warning(
+                "tesseract OCR 失败，降级返回空文本", error=str(exc), exc_info=True
+            )
+            return ""
+
+
+class NoopOcrEngine:
+    """关闭 OCR 的占位插件（strategy=none 时使用）"""
+
+    def ocr_pdf(self, content: bytes, *, max_pages: int, dpi: int) -> str:
+        return ""
+
+
+# ---------------------------------------------------------------------------- #
+# 插件注册表
+# ---------------------------------------------------------------------------- #
+
+_PDF_PLUGINS: dict[str, type[PdfTextExtractor]] = {
+    "pypdf": PypdfTextExtractor,
+    "pdfplumber": PdfplumberTextExtractor,
+}
+
+_DOCX_PLUGINS: dict[str, type[DocxParser]] = {
+    "python_docx": PythonDocxParser,
+}
+
+_OCR_PLUGINS: dict[str, type[OcrEngine]] = {
+    "rapidocr": RapidocrOcrEngine,
+    "tesseract": TesseractOcrEngine,
+    "none": NoopOcrEngine,
+}
+
+
+def list_pdf_plugins() -> list[str]:
+    return list(_PDF_PLUGINS.keys())
+
+
+def list_docx_plugins() -> list[str]:
+    return list(_DOCX_PLUGINS.keys())
+
+
+def list_ocr_plugins() -> list[str]:
+    return list(_OCR_PLUGINS.keys())
+
+
+# ---------------------------------------------------------------------------- #
+# 工厂
+# ---------------------------------------------------------------------------- #
+
+# 进程级插件单例缓存
+_pdf_plugin_cache: dict[str, PdfTextExtractor] = {}
+_docx_plugin_cache: dict[str, DocxParser] = {}
+_ocr_plugin_cache: dict[str, OcrEngine] = {}
+
+
+def _get_pdf_plugin() -> PdfTextExtractor:
+    rt = get_runtime_settings()
+    name = rt.parsers.pdf.plugin or "pypdf"
+    if name in _pdf_plugin_cache:
+        return _pdf_plugin_cache[name]
+    cls = _PDF_PLUGINS.get(name)
+    if cls is None:
+        logger.warning("未知 PDF 插件，降级到 pypdf", requested=name)
+        cls = PypdfTextExtractor
+        name = "pypdf"
+    instance = cls()
+    _pdf_plugin_cache[name] = instance
+    return instance
+
+
+def _get_docx_plugin() -> DocxParser:
+    rt = get_runtime_settings()
+    name = rt.parsers.docx.plugin or "python_docx"
+    if name in _docx_plugin_cache:
+        return _docx_plugin_cache[name]
+    cls = _DOCX_PLUGINS.get(name)
+    if cls is None:
+        logger.warning("未知 DOCX 插件，降级到 python_docx", requested=name)
+        cls = PythonDocxParser
+        name = "python_docx"
+    instance = cls()
+    _docx_plugin_cache[name] = instance
+    return instance
+
+
+def _get_ocr_plugin() -> OcrEngine:
+    rt = get_runtime_settings()
+    name = rt.parsers.ocr.plugin or "rapidocr"
+    if name in _ocr_plugin_cache:
+        return _ocr_plugin_cache[name]
+    cls = _OCR_PLUGINS.get(name)
+    if cls is None:
+        logger.warning("未知 OCR 插件，降级到 rapidocr", requested=name)
+        cls = RapidocrOcrEngine
+        name = "rapidocr"
+    instance = cls()
+    _ocr_plugin_cache[name] = instance
+    return instance
+
+
+def invalidate_parser_plugin_cache(kind: str | None = None) -> None:
+    """清除插件缓存（runtime_settings 更新后调用）"""
+    if kind is None or kind == "pdf":
+        _pdf_plugin_cache.clear()
+    if kind is None or kind == "docx":
+        _docx_plugin_cache.clear()
+    if kind is None or kind == "ocr":
+        _ocr_plugin_cache.clear()
+        # 重置 RapidocrOcrEngine 类级标记，允许重新初始化
+        RapidocrOcrEngine._engine = None
+        RapidocrOcrEngine._unavailable = False
+        TesseractOcrEngine._unavailable = False
+
+
+# ---------------------------------------------------------------------------- #
+# 顶层解析函数
+# ---------------------------------------------------------------------------- #
+
+
+def _parse_pdf(content: bytes) -> str:
+    """PDF 解析：优先文本层插件；文本层为空时降级 OCR 插件"""
+    rt = get_runtime_settings()
+    pdf_plugin = _get_pdf_plugin()
+    try:
+        text_layer = pdf_plugin.extract_text(content)
+    except Exception as exc:
+        logger.warning(
+            "PDF 文本层提取失败，尝试 OCR 降级",
+            plugin=rt.parsers.pdf.plugin,
+            error=str(exc),
+            exc_info=True,
+        )
+        text_layer = ""
 
-    # 文本层非空：直接返回
     if text_layer:
         return text_layer
 
-    # 文本层为空 → 尝试 OCR 降级
+    # 文本层为空 → OCR 降级
     if not settings.pdf_ocr_enabled:
         return ""
 
-    ocr_text = _ocr_pdf(
-        content, max_pages=settings.pdf_ocr_max_pages, dpi=settings.pdf_ocr_dpi
+    ocr_plugin = _get_ocr_plugin()
+    return ocr_plugin.ocr_pdf(
+        content,
+        max_pages=rt.parsers.ocr.params.get("max_pages", settings.pdf_ocr_max_pages),
+        dpi=rt.parsers.ocr.params.get("dpi", settings.pdf_ocr_dpi),
     )
-    return ocr_text
-
-
-def _ocr_pdf(content: bytes, max_pages: int, dpi: int) -> str:
-    """对扫描件 PDF 跑 OCR：渲染每页 → 识别 → 拼接
-
-    返回空字符串的场景：依赖未安装 / 渲染或识别异常 / 无识别结果。
-    任何异常仅告警不抛出，由上游按"无法提取文本"处理。
-    """
-    global _ocr_engine, _ocr_unavailable
-
-    if _ocr_unavailable:
-        return ""
-
-    # 1. 懒加载 OCR 引擎
-    if _ocr_engine is None:
-        try:
-            from rapidocr_onnxruntime import RapidOCR
-
-            _ocr_engine = RapidOCR()
-            logger.info("PDF OCR 引擎已初始化", dpi=dpi)
-        except Exception:
-            _ocr_unavailable = True
-            logger.warning("OCR 依赖不可用，扫描件 PDF 将无法提取文本", exc_info=True)
-            return ""
-
-    # 2. 渲染并识别
-    try:
-        import pypdfium2 as pdfium
-
-        scale = max(1.0, dpi / 72.0)
-        pdf = pdfium.PdfDocument(io.BytesIO(content))
-        total = min(len(pdf), max(1, max_pages))
-        page_texts: list[str] = []
-        for i in range(total):
-            page = pdf[i]
-            pil_image = page.render(scale=scale).to_pil()
-            result, _ = _ocr_engine(pil_image)
-            if result:
-                # result: [[box, text, score], ...]，按行拼接
-                lines = [
-                    item[1] for item in result if item and len(item) >= 2 and item[1]
-                ]
-                if lines:
-                    page_texts.append("\n".join(lines))
-        pdf.close()
-        return "\n".join(page_texts).strip()
-    except Exception as exc:
-        logger.warning("PDF OCR 失败，降级返回空文本", error=str(exc), exc_info=True)
-        return ""
 
 
 def _parse_docx(content: bytes) -> str:
-    """DOCX 段落文本拼接（不含表格/页眉页脚）"""
-    from docx import Document  # type: ignore[import-untyped]
-
-    document = Document(io.BytesIO(content))
-    parts = [p.text for p in document.paragraphs if p.text and p.text.strip()]
-    return "\n".join(parts).strip()
+    """DOCX 解析"""
+    return _get_docx_plugin().extract_text(content)
 
 
-# 扩展名 → 解析函数映射（启动时构建，避免每次请求重复构造）
+# 扩展名 → 解析函数映射
 _PARSERS: dict[str, Callable[[bytes], str]] = {
     ".txt": _parse_text,
     ".md": _parse_text,
diff --git a/app/core/ingest_tasks.py b/app/core/ingest_tasks.py
index a0c9c57..15bd1e6 100644
--- a/app/core/ingest_tasks.py
+++ b/app/core/ingest_tasks.py
@@ -6,10 +6,12 @@
 内存注册表为主（记录 status/created_at/updated_at/result/error），
 Redis 为持久镜像（key: ingest_task:{task_id}），每次状态迁移同步写入；
 Redis 不可用或写入失败仅记录 warning，不影响任务执行。
+
+文本去重委托给 app.core.dedup.get_dedup_strategy()，按 runtime_settings.dedup
+选择策略（none/sha256/simhash）。
 """
 
 import asyncio
-import hashlib
 import uuid
 from datetime import UTC, datetime
 from enum import StrEnum
@@ -18,6 +20,7 @@ from typing import Any
 import structlog
 
 from app.config import Settings
+from app.core.dedup import DEDUP_KEY_PREFIX, get_dedup_strategy
 from app.core.ingestion import Ingester, IngestionError
 from app.models.document import DocumentInput
 from app.services.redis import RedisCache
@@ -26,8 +29,6 @@ logger = structlog.get_logger()
 
 # Redis 任务状态 key 前缀
 REDIS_KEY_PREFIX = "ingest_task:"
-# Redis 文本去重 key 前缀（value 为已入库文档的 IngestionResult JSON）
-DEDUP_KEY_PREFIX = "dedup:sha256:"
 
 
 class IngestTaskStatus(StrEnum):
@@ -71,17 +72,17 @@ class IngestTaskManager:
     async def submit(self, doc: DocumentInput) -> str:
         """登记入库任务并后台执行，立即返回 task_id
 
-        文本去重：基于 doc.text 的 sha256 在 Redis 中查重；命中则直接复用旧
-        IngestionResult（仅置 deduplicated=True），不重跑流水线；未命中走原
-        异步入库流程，完成后写入去重记录供后续命中复用。Redis 不可用时跳过
-        去重，按原流程执行，不影响主流程。
+        文本去重：按 runtime_settings.dedup 选择策略（none/sha256/simhash）；
+        命中则直接复用旧 IngestionResult（仅置 deduplicated=True），不重跑流水线；
+        未命中走原异步入库流程，完成后写入去重记录供后续命中复用。
+        Redis 不可用或策略=none 时跳过，按原流程执行。
         """
         task_id = uuid.uuid4().hex
         now = _utc_now_iso()
-        text_hash = hashlib.sha256(doc.text.encode("utf-8")).hexdigest()
+        dedup = get_dedup_strategy(self._redis)
 
         # 1. 去重命中：直接置 done，复用旧结果，不调 _run
-        dedup_record = await self._lookup_dedup(text_hash)
+        dedup_record = await dedup.lookup(doc.text)
         if dedup_record is not None:
             result_dict = dict(dedup_record)
             result_dict["deduplicated"] = True
@@ -111,7 +112,7 @@ class IngestTaskManager:
             "error": None,
         }
         self._schedule_mirror(task_id)
-        background = asyncio.create_task(self._run(task_id, doc, text_hash))
+        background = asyncio.create_task(self._run(task_id, doc, dedup))
         self._background_tasks.add(background)
         background.add_done_callback(self._background_tasks.discard)
         logger.info("入库任务已登记", task_id=task_id, title=doc.title)
@@ -151,7 +152,7 @@ class IngestTaskManager:
                 raise TimeoutError(f"入库任务 {task_id} 在 {timeout}s 内未进入终态")
             await asyncio.sleep(0.01)
 
-    async def _run(self, task_id: str, doc: DocumentInput, text_hash: str) -> None:
+    async def _run(self, task_id: str, doc: DocumentInput, dedup: Any) -> None:
         """后台执行入库：并发限流 + 阶段状态推进 + 结果/错误落账 + 去重记录写入"""
         async with self._semaphore:
             try:
@@ -185,34 +186,9 @@ class IngestTaskManager:
                     result=result_dict,
                 )
                 self._schedule_mirror(task_id)
-                await self._record_dedup(text_hash, result_dict)
+                await dedup.record(doc.text, result_dict)
                 logger.info("入库任务完成", task_id=task_id)
 
-    async def _lookup_dedup(self, text_hash: str) -> dict[str, Any] | None:
-        """查询文本去重记录；Redis 不可用或异常时降级为未命中"""
-        if self._redis is None:
-            return None
-        try:
-            return await self._redis.get_json(f"{DEDUP_KEY_PREFIX}{text_hash}")
-        except Exception:
-            logger.warning(
-                "去重记录查询失败，降级为未命中", text_hash=text_hash, exc_info=True
-            )
-            return None
-
-    async def _record_dedup(self, text_hash: str, result_dict: dict[str, Any]) -> None:
-        """写入文本去重记录（含完整 IngestionResult），供后续命中复用；失败仅告警"""
-        if self._redis is None:
-            return
-        try:
-            await self._redis.set_json(
-                f"{DEDUP_KEY_PREFIX}{text_hash}",
-                result_dict,
-                ttl=self._settings.ingest_task_ttl_done,
-            )
-        except Exception:
-            logger.warning("去重记录写入失败", text_hash=text_hash, exc_info=True)
-
     def _finish_failed(self, task_id: str, error: dict[str, Any]) -> None:
         """将任务置为 failed 并记录错误信息"""
         self._tasks[task_id].update(
diff --git a/app/core/query_parser.py b/app/core/query_parser.py
index 29c0ed3..82fc92e 100644
--- a/app/core/query_parser.py
+++ b/app/core/query_parser.py
@@ -1,6 +1,7 @@
 """query 解析与分类路由模块
 
-分层 RAG 在线侧第一步：用 Ollama 小模型将用户 query 解析为结构化 JSON
+分层 RAG 在线侧第一步：用 LLM（Ollama 或 OpenAI 兼容服务，由
+runtime_settings.models.query 决定）将用户 query 解析为结构化 JSON
 （命中类目+置信度、rewrite 后 query、关键词），再由纯函数做路由决策：
 - 高置信且命中类目数 <= 上限 → 按类目过滤检索
 - 低置信 / 解析失败 / 命中类目过多 → 全库兜底（不丢召回）
@@ -16,8 +17,8 @@ import structlog
 from pydantic import BaseModel, Field, ValidationError
 
 from app.config import settings
-from app.models.knowledge import UNCATEGORIZED, TaxonomyCategory
-from app.services.ollama import OllamaClient
+from app.models.knowledge import UNCATEGORIZED, TaxonomyCategory, load_taxonomy
+from app.services.llm import LLMClient, create_llm_client
 from app.services.redis import RedisCache, get_cache
 
 logger = structlog.get_logger()
@@ -106,17 +107,22 @@ def decide_route(parsed: ParsedQuery, threshold: float, max_categories: int) ->
 
 
 class QueryParser:
-    """query 解析器：调用 Ollama 小模型将 query 解析为结构化 JSON"""
+    """query 解析器：调用 LLM 将 query 解析为结构化 JSON"""
 
     def __init__(
-        self, ollama: OllamaClient, taxonomy: list[TaxonomyCategory], cache: RedisCache | None = None
+        self,
+        ollama: LLMClient | None = None,
+        taxonomy: list[TaxonomyCategory] | None = None,
+        cache: RedisCache | None = None,
     ) -> None:
-        self.ollama = ollama
-        self.taxonomy = taxonomy
+        # 默认按 runtime_settings.models.query 选择 LLM 实现；
+        # 测试可通过 ollama 参数注入替身。
+        self.ollama = ollama or create_llm_client("query")
+        self.taxonomy = taxonomy if taxonomy is not None else load_taxonomy()
         # 解析结果缓存，缺省用全局单例；RedisCache 全操作容错，缓存不可用时退化为无缓存行为
         self.cache = cache if cache is not None else get_cache()
         # 可作为路由命中类目的名字集合（uncategorized 不可作为路由命中类目）
-        self._routable_names = {c.name for c in taxonomy if c.name != UNCATEGORIZED}
+        self._routable_names = {c.name for c in self.taxonomy if c.name != UNCATEGORIZED}
 
     async def parse(self, query: str) -> ParsedQuery:
         """调用 LLM 将 query 解析为结构化结果
diff --git a/app/core/result_summarizer.py b/app/core/result_summarizer.py
index eedef9b..6bdc20b 100644
--- a/app/core/result_summarizer.py
+++ b/app/core/result_summarizer.py
@@ -1,6 +1,7 @@
 """检索结果 AI 总结
 
-对检索返回的 chunk 命中结果，调用 Ollama 本地模型生成一段针对用户 query 的总结回答。
+对检索返回的 chunk 命中结果，调用 LLM（Ollama 或 OpenAI 兼容服务，由
+runtime_settings.models.query 决定）生成一段针对用户 query 的总结回答。
 仅基于检索结果内容，不编造未提及的信息。
 """
 
@@ -8,7 +9,7 @@ import structlog
 
 from app.config import settings
 from app.models.search import SearchHit
-from app.services.ollama import OllamaClient
+from app.services.llm import LLMClient, create_llm_client
 
 logger = structlog.get_logger()
 
@@ -16,8 +17,10 @@ logger = structlog.get_logger()
 class ResultSummarizer:
     """检索结果总结器"""
 
-    def __init__(self, ollama: OllamaClient | None = None) -> None:
-        self.ollama = ollama or OllamaClient()
+    def __init__(self, ollama: LLMClient | None = None) -> None:
+        # 默认按 runtime_settings.models.query 选择 LLM 实现；
+        # 测试可通过 ollama 参数注入替身。
+        self.ollama = ollama or create_llm_client("query")
 
     async def summarize(self, query: str, hits: list[SearchHit]) -> str:
         """对检索结果生成针对 query 的总结
diff --git a/app/core/retriever.py b/app/core/retriever.py
index 9240f68..c9fa4a7 100644
--- a/app/core/retriever.py
+++ b/app/core/retriever.py
@@ -21,7 +21,7 @@ from app.core.result_summarizer import ResultSummarizer
 from app.core.sparse import SparseEncoder
 from app.models.knowledge import load_taxonomy
 from app.models.search import ExtractedInfo, SearchHit, SearchRequest, SearchResponse
-from app.services.ollama import OllamaClient
+from app.services.llm import create_llm_client
 from app.services.qdrant import (
     COLLECTION_CHUNKS,
     COLLECTION_L1,
@@ -52,7 +52,7 @@ class Retriever:
     ) -> None:
         self.qdrant = qdrant or QdrantService()
         self.query_parser = query_parser or QueryParser(
-            ollama=OllamaClient(),
+            ollama=create_llm_client("query"),
             taxonomy=load_taxonomy(settings.taxonomy_path),
         )
         self.embedding = embedding or create_embedding_service()
diff --git a/app/core/runtime_settings.py b/app/core/runtime_settings.py
new file mode 100644
index 0000000..de7cdea
--- /dev/null
+++ b/app/core/runtime_settings.py
@@ -0,0 +1,224 @@
+"""运行时可调配置（runtime settings）
+
+与 `app.config.settings`（启动时从环境变量加载、不可变）互补：本模块管理运行时
+可通过管理后台动态调整的子集，持久化到 JSON 文件，启动时加载覆盖到内存单例。
+
+设计要点：
+- RuntimeSettings 只包含「可运行时调整」的字段（模型/解析插件/去重等），
+  不包含敏感或启动期固定的字段（端口、数据库连接等）。
+- 持久化路径默认 `data/runtime_settings.json`，可由 env `RUNTIME_SETTINGS_PATH` 覆盖。
+- 加载失败/文件缺失时回退到默认值，不阻塞启动。
+- 写入采用「先临时文件后 rename」原子替换，避免半写损坏。
+- 全模块只通过 `get_runtime_settings()` 访问单例，避免直接读 JSON。
+"""
+
+from __future__ import annotations
+
+import json
+import os
+import tempfile
+from pathlib import Path
+from threading import RLock
+from typing import Any, Literal
+
+import structlog
+from pydantic import BaseModel, Field
+
+from app.config import settings
+
+logger = structlog.get_logger()
+
+# 默认持久化路径（相对工作目录）；可由 env 覆盖
+DEFAULT_RUNTIME_SETTINGS_PATH = "./data/runtime_settings.json"
+
+_lock = RLock()
+
+
+# ---------------------------------------------------------------------------- #
+# 模型配置（文档总结 / 查询 / 分类 各一份独立配置）
+# ---------------------------------------------------------------------------- #
+
+class LlmProviderConfig(BaseModel):
+    """单个用途的 LLM 提供方配置"""
+
+    provider: Literal["ollama", "openai_compatible"] = Field(
+        default="ollama", description="提供方：ollama 走 Ollama HTTP；openai_compatible 走 OpenAI 兼容 chat/completions"
+    )
+    base_url: str = Field(default="", description="服务地址；空则 ollama 用 settings.ollama_base_url，openai_compatible 用 settings.openai_base_url")
+    api_key: str = Field(default="", description="API Key（仅 openai_compatible 需要；ollama 忽略）")
+    model: str = Field(default="", description="模型名；空则 ollama 用 settings.ollama_model，openai_compatible 用 settings.embedding_model 同级（如 gpt-4o-mini）")
+    timeout: float = Field(default=120.0, description="请求超时秒数")
+    temperature: float = Field(default=0.3, description="采样温度（0~2）")
+
+
+class ModelSettings(BaseModel):
+    """模型相关运行时配置：三种用途独立配置"""
+
+    summarize: LlmProviderConfig = Field(default_factory=LlmProviderConfig, description="文档三级总结")
+    query: LlmProviderConfig = Field(default_factory=LlmProviderConfig, description="检索链路 query 解析与结果总结")
+    classify: LlmProviderConfig = Field(default_factory=LlmProviderConfig, description="文档分类判定")
+
+
+# ---------------------------------------------------------------------------- #
+# 解析插件配置
+# ---------------------------------------------------------------------------- #
+
+class PluginConfig(BaseModel):
+    """单个解析插件的选择与参数"""
+
+    plugin: str = Field(default="", description="插件名；空则用默认")
+    params: dict[str, Any] = Field(default_factory=dict, description="插件参数（透传给插件实现）")
+
+
+class ParserSettings(BaseModel):
+    """解析插件运行时配置"""
+
+    ocr: PluginConfig = Field(default_factory=lambda: PluginConfig(plugin="rapidocr"), description="OCR 插件")
+    pdf: PluginConfig = Field(default_factory=lambda: PluginConfig(plugin="pypdf"), description="PDF 文本层提取插件")
+    docx: PluginConfig = Field(default_factory=lambda: PluginConfig(plugin="python_docx"), description="DOCX 解析插件")
+
+
+# ---------------------------------------------------------------------------- #
+# 去重策略配置
+# ---------------------------------------------------------------------------- #
+
+class DedupSettings(BaseModel):
+    """文本去重策略运行时配置"""
+
+    strategy: Literal["none", "sha256", "simhash"] = Field(
+        default="sha256", description="去重策略：none 关闭；sha256 精确匹配；simhash 近似匹配"
+    )
+    simhash_threshold: int = Field(default=3, description="simhash 海明距离阈值（仅 strategy=simhash 生效，0~64）")
+    ttl_seconds: int = Field(default=86400, description="去重记录 Redis 保留秒数")
+
+
+# ---------------------------------------------------------------------------- #
+# 顶层 RuntimeSettings
+# ---------------------------------------------------------------------------- #
+
+class RuntimeSettings(BaseModel):
+    """运行时可调配置顶层模型"""
+
+    models: ModelSettings = Field(default_factory=ModelSettings)
+    parsers: ParserSettings = Field(default_factory=ParserSettings)
+    dedup: DedupSettings = Field(default_factory=DedupSettings)
+
+
+# ---------------------------------------------------------------------------- #
+# 单例 + 持久化
+# ---------------------------------------------------------------------------- #
+
+_runtime_settings: RuntimeSettings | None = None
+
+
+def _resolve_path() -> Path:
+    """解析持久化文件路径：env RUNTIME_SETTINGS_PATH > settings 自定义 > 默认"""
+    path_str = os.environ.get("RUNTIME_SETTINGS_PATH", "") or getattr(settings, "runtime_settings_path", "") or DEFAULT_RUNTIME_SETTINGS_PATH
+    return Path(path_str).expanduser().resolve()
+
+
+def _default_with_env_fallback() -> RuntimeSettings:
+    """构造默认 RuntimeSettings，并把启动 env 中已有的模型相关字段填充进去
+
+    这样首次启动（无持久化文件）时，UI 显示的不是空字符串而是 env 当前值。
+    """
+    cfg = RuntimeSettings()
+    # 模型默认值沿用 env
+    cfg.models.summarize.base_url = settings.ollama_base_url
+    cfg.models.summarize.model = settings.ollama_model
+    cfg.models.query.base_url = settings.ollama_base_url
+    cfg.models.query.model = settings.ollama_model
+    cfg.models.classify.base_url = settings.ollama_base_url
+    cfg.models.classify.model = settings.ollama_model
+    # 若 env 提供了 OpenAI key/url，预填到 openai_compatible 字段方便切换
+    if settings.openai_api_key:
+        for usage in ("summarize", "query", "classify"):
+            getattr(cfg.models, usage).api_key = settings.openai_api_key
+            getattr(cfg.models, usage).base_url = settings.openai_base_url if settings.openai_base_url else getattr(cfg.models, usage).base_url
+    return cfg
+
+
+def load_runtime_settings() -> RuntimeSettings:
+    """从磁盘加载 RuntimeSettings；文件缺失或损坏时回退到默认值（带 env 兜底）"""
+    path = _resolve_path()
+    try:
+        if path.exists():
+            data = json.loads(path.read_text(encoding="utf-8"))
+            return RuntimeSettings.model_validate(data)
+    except Exception:
+        logger.warning("RuntimeSettings 加载失败，回退默认值", path=str(path), exc_info=True)
+    return _default_with_env_fallback()
+
+
+def save_runtime_settings(cfg: RuntimeSettings) -> None:
+    """原子写入 RuntimeSettings 到磁盘（先临时文件后 rename）"""
+    path = _resolve_path()
+    path.parent.mkdir(parents=True, exist_ok=True)
+    data = cfg.model_dump(mode="json")
+    # 写到同目录临时文件再 rename，避免半写损坏
+    fd, tmp_path = tempfile.mkstemp(prefix=".runtime_settings.", suffix=".tmp", dir=str(path.parent))
+    try:
+        with os.fdopen(fd, "w", encoding="utf-8") as f:
+            json.dump(data, f, ensure_ascii=False, indent=2)
+        os.replace(tmp_path, path)
+    except Exception:
+        try:
+            os.unlink(tmp_path)
+        except OSError:
+            pass
+        raise
+
+
+def get_runtime_settings() -> RuntimeSettings:
+    """获取 RuntimeSettings 单例（首次调用时加载）"""
+    global _runtime_settings
+    with _lock:
+        if _runtime_settings is None:
+            _runtime_settings = load_runtime_settings()
+        return _runtime_settings
+
+
+def update_runtime_settings(patch: dict[str, Any]) -> RuntimeSettings:
+    """以 patch 字典更新 RuntimeSettings 并持久化
+
+    支持部分更新（顶层键可缺失，缺省保留原值）。例如：
+        update_runtime_settings({"models": {"summarize": {"model": "qwen2.5:3b"}}})
+    """
+    with _lock:
+        current = get_runtime_settings()
+        merged = current.model_dump(mode="json")
+        _deep_merge(merged, patch)
+        new_cfg = RuntimeSettings.model_validate(merged)
+        save_runtime_settings(new_cfg)
+        # 替换单例后立即返回，新值对所有后续读取生效
+        global _runtime_settings
+        _runtime_settings = new_cfg
+        logger.info("RuntimeSettings 已更新并持久化", path=str(_resolve_path()))
+        return new_cfg
+
+
+def _deep_merge(target: dict[str, Any], patch: dict[str, Any]) -> None:
+    """递归把 patch 合并到 target（同 key 字典则递归，否则覆盖）"""
+    for k, v in patch.items():
+        if k in target and isinstance(target[k], dict) and isinstance(v, dict):
+            _deep_merge(target[k], v)
+        else:
+            target[k] = v
+
+
+def reload_runtime_settings() -> RuntimeSettings:
+    """强制从磁盘重新加载（管理后台触发）"""
+    with _lock:
+        global _runtime_settings
+        _runtime_settings = load_runtime_settings()
+        return _runtime_settings
+
+
+def reset_runtime_settings() -> RuntimeSettings:
+    """重置为默认值并持久化（管理后台触发）"""
+    with _lock:
+        new_cfg = _default_with_env_fallback()
+        save_runtime_settings(new_cfg)
+        global _runtime_settings
+        _runtime_settings = new_cfg
+        return new_cfg
diff --git a/app/core/summarizer.py b/app/core/summarizer.py
index 909f65a..5752300 100644
--- a/app/core/summarizer.py
+++ b/app/core/summarizer.py
@@ -1,6 +1,7 @@
 """文档三级总结模块
 
-通过 Ollama 本地小模型对文档进行分级总结：
+通过 LLM（Ollama 或 OpenAI 兼容服务，由 runtime_settings.models.summarize 决定）
+对文档进行分级总结：
 - L1: 总结（一句话高度概括）
 - L2: 大纲（主要章节和关键主题）
 - L3: 内容大纲（每个章节的详细内容摘要）
@@ -12,7 +13,7 @@ import structlog
 
 from app.core.headings import parse_headings, render_outline
 from app.models.document import DocumentSummary, SummaryLevel
-from app.services.ollama import OllamaClient
+from app.services.llm import LLMClient, create_llm_client
 
 logger = structlog.get_logger()
 
@@ -23,8 +24,10 @@ MIN_TEXT_LENGTH_FOR_L3 = 500
 class Summarizer:
     """文档三级总结器"""
 
-    def __init__(self, ollama: OllamaClient | None = None) -> None:
-        self.ollama = ollama or OllamaClient()
+    def __init__(self, ollama: LLMClient | None = None) -> None:
+        # 默认按 runtime_settings 选择 LLM 实现（Ollama 或 OpenAI 兼容）；
+        # 测试可通过 ollama 参数注入替身。
+        self.ollama = ollama or create_llm_client("summarize")
 
     async def summarize(self, text: str, *, title: str = "") -> DocumentSummary:
         """对文档文本进行三级总结
diff --git a/app/main.py b/app/main.py
index 998a835..5361416 100644
--- a/app/main.py
+++ b/app/main.py
@@ -5,13 +5,14 @@ from pathlib import Path
 import structlog
 from fastapi import FastAPI, Request
 from fastapi.exceptions import RequestValidationError
-from fastapi.responses import FileResponse, JSONResponse
+from fastapi.responses import FileResponse, JSONResponse, RedirectResponse
 
 from app.api.response import ApiError, error
 from app.api.v1.auth import router as auth_router
 from app.api.v1.document import router as document_router
 from app.api.v1.knowledge import router as knowledge_router
 from app.api.v1.search import router as search_router
+from app.api.v1.settings import router as settings_router
 from app.config import settings
 from app.core.auth import ensure_default_admin
 from app.services.qdrant import QdrantService
@@ -53,6 +54,7 @@ app.include_router(auth_router)
 app.include_router(search_router)
 app.include_router(document_router)
 app.include_router(knowledge_router)
+app.include_router(settings_router)
 
 
 @app.exception_handler(ApiError)
@@ -84,10 +86,54 @@ async def health() -> dict[str, str]:
     return {"status": "ok"}
 
 
-_ADMIN_HTML = Path(__file__).resolve().parent / "static" / "admin.html"
+_STATIC_DIR = Path(__file__).resolve().parent / "static"
+_ADMIN_HTML = _STATIC_DIR / "admin.html"
+_ADMIN_SPA_DIR = _STATIC_DIR / "admin"
+
+
+def _spa_index() -> Path | None:
+    """SPA 入口文件路径；不存在返回 None（回退旧 admin.html）"""
+    index = _ADMIN_SPA_DIR / "index.html"
+    return index if index.is_file() else None
 
 
 @app.get("/admin", include_in_schema=False)
-async def admin_page() -> FileResponse:
-    """管理后台单页（单文件静态 HTML，零外部依赖）"""
+async def admin_page():
+    """管理后台：优先服务 Vue SPA，回退到旧单文件 admin.html"""
+    spa = _spa_index()
+    if spa is not None:
+        return FileResponse(spa, media_type="text/html")
     return FileResponse(_ADMIN_HTML, media_type="text/html")
+
+
+@app.get("/admin/", include_in_schema=False)
+async def admin_page_trailing_slash():
+    """带斜杠的 /admin/ 重定向到 /admin"""
+    return RedirectResponse(url="/admin", status_code=307)
+
+
+@app.get("/admin/{rest:path}", include_in_schema=False)
+async def admin_spa(rest: str):
+    """SPA 静态资源与客户端路由兜底
+
+    - 真实文件（assets/*.js, *.css 等）→ 直接返回
+    - 其余路径（/overview, /documents 等客户端路由）→ 返回 index.html
+    - SPA 目录不存在时 → 404（旧 admin.html 无子路由需求）
+    """
+    spa_dir = _ADMIN_SPA_DIR
+    if not spa_dir.is_dir():
+        return JSONResponse(
+            status_code=404, content={"code": 1002, "message": "Not found"}
+        )
+
+    # 安全校验：防止路径越界
+    file_path = (spa_dir / rest).resolve()
+    try:
+        file_path.relative_to(spa_dir.resolve())
+    except ValueError:
+        return FileResponse(spa_dir / "index.html", media_type="text/html")
+
+    if file_path.is_file():
+        return FileResponse(file_path)
+    # SPA 客户端路由兜底
+    return FileResponse(spa_dir / "index.html", media_type="text/html")
diff --git a/app/services/llm.py b/app/services/llm.py
new file mode 100644
index 0000000..1d661f1
--- /dev/null
+++ b/app/services/llm.py
@@ -0,0 +1,179 @@
+"""LLM 客户端抽象层
+
+提供统一的 `generate(prompt, json_mode)` 接口，底层实现可切换：
+- OllamaLLMClient：走 Ollama HTTP /api/generate（本地或远程 Ollama 服务）
+- OpenAICompatibleLLMClient：走 OpenAI 兼容 /v1/chat/completions（OpenAI / DeepSeek / 智谱 / Qwen API 等）
+
+工厂 `create_llm_client(purpose)` 根据 runtime_settings 选择实现与参数。
+所有客户端共享同一接口，业务侧无需感知底层协议差异。
+"""
+
+from __future__ import annotations
+
+from typing import Literal, Protocol, runtime_checkable
+
+import httpx
+import structlog
+
+from app.config import settings
+from app.core.runtime_settings import LlmProviderConfig, get_runtime_settings
+from app.services.ollama import OllamaClient
+
+logger = structlog.get_logger()
+
+LlmPurpose = Literal["summarize", "query", "classify"]
+
+
+@runtime_checkable
+class LLMClient(Protocol):
+    """LLM 客户端统一接口"""
+
+    async def generate(self, prompt: str, json_mode: bool = False) -> str:
+        """生成文本
+
+        Args:
+            prompt: 输入提示词
+            json_mode: True 时约束输出为 JSON（不支持时降级为普通生成）
+
+        Returns:
+            生成的文本内容
+        """
+        ...
+
+    async def is_available(self) -> bool:
+        """检查服务是否可用"""
+        ...
+
+
+class OllamaLLMClient:
+    """Ollama HTTP API 客户端（包装现有 OllamaClient，便于统一接口）"""
+
+    def __init__(self, base_url: str, model: str, timeout: float = 120.0) -> None:
+        self._inner = OllamaClient(base_url=base_url, model=model, timeout=timeout)
+
+    async def generate(self, prompt: str, json_mode: bool = False) -> str:
+        return await self._inner.generate(prompt, json_mode=json_mode)
+
+    async def is_available(self) -> bool:
+        return await self._inner.is_available()
+
+
+class OpenAICompatibleLLMClient:
+    """OpenAI 兼容 chat/completions 客户端
+
+    适用于 OpenAI 官方 API、DeepSeek、智谱 ChatGLM、Qwen DashScope、Moonshot 等
+    所有兼容 OpenAI /v1/chat/completions 协议的服务。
+    """
+
+    def __init__(self, base_url: str, api_key: str, model: str, timeout: float = 120.0, temperature: float = 0.3) -> None:
+        self.base_url = base_url.rstrip("/")
+        self.api_key = api_key
+        self.model = model
+        self.timeout = timeout
+        self.temperature = temperature
+
+    async def generate(self, prompt: str, json_mode: bool = False) -> str:
+        url = f"{self.base_url}/chat/completions"
+        payload: dict = {
+            "model": self.model,
+            "messages": [{"role": "user", "content": prompt}],
+            "temperature": self.temperature,
+            "stream": False,
+        }
+        if json_mode:
+            payload["response_format"] = {"type": "json_object"}
+
+        headers = {
+            "Authorization": f"Bearer {self.api_key}",
+            "Content-Type": "application/json",
+        }
+        async with httpx.AsyncClient(timeout=self.timeout) as client:
+            resp = await client.post(url, json=payload, headers=headers)
+            resp.raise_for_status()
+            data = resp.json()
+
+        # OpenAI 标准响应结构：choices[0].message.content
+        choices = data.get("choices") or []
+        if not choices:
+            logger.warning("OpenAI 兼容响应无 choices", model=self.model, raw_keys=list(data.keys()))
+            return ""
+        message = choices[0].get("message") or {}
+        content = message.get("content") or ""
+        logger.debug("OpenAI 兼容生成完成", model=self.model, output_length=len(content))
+        return content
+
+    async def is_available(self) -> bool:
+        """简单探测：调 /models 列表接口（多数 OpenAI 兼容服务支持）"""
+        try:
+            async with httpx.AsyncClient(timeout=5.0) as client:
+                resp = await client.get(
+                    f"{self.base_url}/models",
+                    headers={"Authorization": f"Bearer {self.api_key}"},
+                )
+                return resp.status_code == 200
+        except httpx.HTTPError:
+            return False
+
+
+# ---------------------------------------------------------------------------- #
+# 工厂
+# ---------------------------------------------------------------------------- #
+
+# 进程级客户端缓存（避免每请求新建 httpx client）
+_client_cache: dict[str, LLMClient] = {}
+
+
+def _resolve_provider_config(purpose: LlmPurpose) -> LlmProviderConfig:
+    """从 runtime_settings 取指定用途的 LLM 配置"""
+    rt = get_runtime_settings()
+    return getattr(rt.models, purpose)
+
+
+def _build_client(purpose: LlmPurpose) -> LLMClient:
+    """按 runtime_settings 构造 LLM 客户端"""
+    cfg = _resolve_provider_config(purpose)
+
+    if cfg.provider == "ollama":
+        base_url = cfg.base_url or settings.ollama_base_url
+        model = cfg.model or settings.ollama_model
+        return OllamaLLMClient(base_url=base_url, model=model, timeout=cfg.timeout)
+
+    if cfg.provider == "openai_compatible":
+        base_url = cfg.base_url or settings.openai_base_url
+        api_key = cfg.api_key or settings.openai_api_key
+        # openai_compatible 默认模型：若 cfg.model 为空，退化到 OpenAI 通用 chat 模型
+        model = cfg.model or "gpt-4o-mini"
+        if not api_key:
+            logger.warning("OpenAI 兼容 provider 缺少 api_key，调用大概率会失败", purpose=purpose)
+        return OpenAICompatibleLLMClient(
+            base_url=base_url, api_key=api_key, model=model, timeout=cfg.timeout, temperature=cfg.temperature
+        )
+
+    raise ValueError(f"未知 LLM provider: {cfg.provider}")
+
+
+def create_llm_client(purpose: LlmPurpose, *, use_cache: bool = True) -> LLMClient:
+    """创建指定用途的 LLM 客户端
+
+    Args:
+        purpose: 用途（summarize / query / classify）
+        use_cache: True 时复用进程级客户端单例（默认）；False 每次新建（测试用）
+
+    Returns:
+        LLMClient 实例
+    """
+    if not use_cache:
+        return _build_client(purpose)
+
+    cache_key = f"{purpose}"
+    if cache_key not in _client_cache:
+        _client_cache[cache_key] = _build_client(purpose)
+    return _client_cache[cache_key]
+
+
+def invalidate_llm_client_cache(purpose: LlmPurpose | None = None) -> None:
+    """清除客户端缓存（runtime_settings 更新后调用，确保后续读取新配置）"""
+    if purpose is None:
+        _client_cache.clear()
+    else:
+        _client_cache.pop(purpose, None)
diff --git a/docker-compose.yml b/docker-compose.yml
index d4b579f..2eeda38 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -10,6 +10,8 @@ services:
       - QDRANT_PORT=6333
       - REDIS_URL=redis://redis:6379/0
       - OLLAMA_BASE_URL=http://ollama:11434
+      # 针对 16 线程 / 61GB 内存的 NAS 调优：放宽入库并发
+      - INGEST_MAX_CONCURRENCY=${INGEST_MAX_CONCURRENCY:-4}
     env_file:
       - .env
     depends_on:
@@ -21,6 +23,7 @@ services:
         condition: service_started
     volumes:
       - ${NAS_DATA_DIR:-./data}/logs:/app/logs
+      - ${NAS_DATA_DIR:-./data}/uploads:/app/uploads
     networks:
       - qmdsearch
 
@@ -65,11 +68,25 @@ services:
       - "${OLLAMA_PORT:-11434}:11434"
     volumes:
       - ${NAS_DATA_DIR:-./data}/ollama:/root/.ollama
-    # 首次启动后需手动拉取模型：
-    #   docker exec qmdsearch-ollama ollama pull qwen2.5:1.5b
-    # 或取消下方 entrypoint 注释以自动拉取（需等待下载完成）
-    # entrypoint: /bin/bash
-    # command: -c "ollama serve & sleep 5 && ollama pull qwen2.5:1.5b && wait"
+    environment:
+      # 针对 Ryzen 9 7940HS（16 线程）的 CPU 推理调优：
+      # 并行推理任务数、常驻模型数、单请求线程上限、KV 缓存量化以省内存
+      - OLLAMA_NUM_PARALLEL=4
+      - OLLAMA_MAX_LOADED_MODELS=2
+      - OLLAMA_NUM_THREADS=16
+      - OLLAMA_KV_CACHE_TYPE=q8_0
+    # 首次启动自动拉取所需模型（qwen2.5:1.5b 总结 + bge-m3 嵌入），
+    # 下载完成后转交常驻 ollama serve。已存在时仅做健康检查。
+    entrypoint: /bin/bash
+    command:
+      - -c
+      - |
+        ollama serve &
+        SERVE_PID=$$!
+        sleep 6
+        ollama pull qwen2.5:1.5b
+        ollama pull bge-m3
+        wait $$SERVE_PID
     networks:
       - qmdsearch
 
diff --git a/frontend/.gitignore b/frontend/.gitignore
new file mode 100644
index 0000000..a1e6ec0
--- /dev/null
+++ b/frontend/.gitignore
@@ -0,0 +1,6 @@
+node_modules
+dist
+dist-ssr
+*.local
+.DS_Store
+.vite
diff --git a/frontend/index.html b/frontend/index.html
new file mode 100644
index 0000000..baa86c3
--- /dev/null
+++ b/frontend/index.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html lang="zh-CN">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>QMDSearch 知识库管理后台</title>
+  </head>
+  <body>
+    <div id="app"></div>
+    <script type="module" src="/src/main.js"></script>
+  </body>
+</html>
diff --git a/frontend/jsconfig.json b/frontend/jsconfig.json
new file mode 100644
index 0000000..18b4628
--- /dev/null
+++ b/frontend/jsconfig.json
@@ -0,0 +1,15 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "jsx": "preserve",
+    "baseUrl": ".",
+    "paths": {
+      "@/*": ["./src/*"]
+    },
+    "checkJs": false
+  },
+  "include": ["src/**/*.js", "src/**/*.vue"],
+  "exclude": ["node_modules", "dist"]
+}
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
new file mode 100644
index 0000000..01b0de2
--- /dev/null
+++ b/frontend/package-lock.json
@@ -0,0 +1,1871 @@
+{
+  "name": "qmdsearch-frontend",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "qmdsearch-frontend",
+      "version": "1.0.0",
+      "dependencies": {
+        "@ant-design/icons-vue": "^7.0.1",
+        "ant-design-vue": "^4.2.6",
+        "axios": "^1.7.9",
+        "dayjs": "^1.11.13",
+        "pinia": "^2.3.0",
+        "vue": "^3.5.13",
+        "vue-router": "^4.5.0"
+      },
+      "devDependencies": {
+        "@vitejs/plugin-vue": "^5.2.1",
+        "vite": "^5.4.11"
+      }
+    },
+    "node_modules/@ant-design/colors": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/@ant-design/colors/-/colors-6.0.0.tgz",
+      "integrity": "sha512-qAZRvPzfdWHtfameEGP2Qvuf838NhergR35o+EuVyB5XvSA98xod5r4utvi4TJ3ywmevm290g9nsCG5MryrdWQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@ctrl/tinycolor": "^3.4.0"
+      }
+    },
+    "node_modules/@ant-design/icons-svg": {
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/@ant-design/icons-svg/-/icons-svg-4.5.0.tgz",
+      "integrity": "sha512-1BTUFyKPTBZ53MuTP8s0k5SFEXL7o3VHEOwLgzaoWKwnBeqIcqUtVshc4SKzhI6uACfqhJqBwBUE9FsWR3uULA==",
+      "license": "MIT"
+    },
+    "node_modules/@ant-design/icons-vue": {
+      "version": "7.0.1",
+      "resolved": "https://registry.npmjs.org/@ant-design/icons-vue/-/icons-vue-7.0.1.tgz",
+      "integrity": "sha512-eCqY2unfZK6Fe02AwFlDHLfoyEFreP6rBwAZMIJ1LugmfMiVgwWDYlp1YsRugaPtICYOabV1iWxXdP12u9U43Q==",
+      "license": "MIT",
+      "dependencies": {
+        "@ant-design/colors": "^6.0.0",
+        "@ant-design/icons-svg": "^4.2.1"
+      },
+      "peerDependencies": {
+        "vue": ">=3.0.3"
+      }
+    },
+    "node_modules/@babel/helper-string-parser": {
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+      "license": "MIT",
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+      },
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+        "parser": "bin/babel-parser.js"
+      },
+      "engines": {
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+      }
+    },
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+      "hasInstallScript": true,
+      "license": "MIT",
+      "bin": {
+        "vue-demi-fix": "bin/vue-demi-fix.js",
+        "vue-demi-switch": "bin/vue-demi-switch.js"
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+      },
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+      "license": "MIT",
+      "dependencies": {
+        "@vue/devtools-api": "^6.6.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/posva"
+      },
+      "peerDependencies": {
+        "vue": "^3.5.0"
+      }
+    },
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+      "license": "MIT",
+      "dependencies": {
+        "is-plain-object": "3.0.1"
+      },
+      "engines": {
+        "node": ">=10.15.0"
+      },
+      "peerDependencies": {
+        "vue": "^3.0.0"
+      }
+    },
+    "node_modules/warning": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/warning/-/warning-4.0.3.tgz",
+      "integrity": "sha512-rpJyN222KWIvHJ/F53XSZv0Zl/accqHR8et1kpaMTD/fLCRxtV8iX8czMzY7sVZupTI3zcUTg8eycS2kNF9l6w==",
+      "license": "MIT",
+      "dependencies": {
+        "loose-envify": "^1.0.0"
+      }
+    }
+  }
+}
diff --git a/frontend/package.json b/frontend/package.json
new file mode 100644
index 0000000..a8d2b06
--- /dev/null
+++ b/frontend/package.json
@@ -0,0 +1,24 @@
+{
+  "name": "qmdsearch-frontend",
+  "version": "1.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@ant-design/icons-vue": "^7.0.1",
+    "ant-design-vue": "^4.2.6",
+    "axios": "^1.7.9",
+    "dayjs": "^1.11.13",
+    "pinia": "^2.3.0",
+    "vue": "^3.5.13",
+    "vue-router": "^4.5.0"
+  },
+  "devDependencies": {
+    "@vitejs/plugin-vue": "^5.2.1",
+    "vite": "^5.4.11"
+  }
+}
diff --git a/frontend/src/App.vue b/frontend/src/App.vue
new file mode 100644
index 0000000..117818c
--- /dev/null
+++ b/frontend/src/App.vue
@@ -0,0 +1,41 @@
+<script setup>
+import { RouterView } from 'vue-router'
+import { ConfigProvider, theme as antdTheme } from 'ant-design-vue'
+
+const themeConfig = {
+  algorithm: antdTheme.defaultAlgorithm,
+  token: {
+    colorPrimary: '#1677ff',
+    colorInfo: '#1677ff',
+    colorSuccess: '#52c41a',
+    colorWarning: '#faad14',
+    colorError: '#ff4d4f',
+    borderRadius: 6,
+    fontSize: 14,
+    fontFamily:
+      "-apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif"
+  },
+  components: {
+    Layout: {
+      headerBg: '#ffffff',
+      headerPadding: '0 16px',
+      headerHeight: 52,
+      siderBg: '#001529'
+    },
+    Menu: {
+      darkItemBg: '#001529',
+      darkSubMenuItemBg: '#000c17'
+    }
+  }
+}
+</script>
+
+<template>
+  <ConfigProvider :theme="themeConfig" :locale="undefined">
+    <RouterView />
+  </ConfigProvider>
+</template>
+
+<style scoped>
+/* 全局根容器无额外样式，由各布局/页面自行处理 */
+</style>
diff --git a/frontend/src/api/auth.js b/frontend/src/api/auth.js
new file mode 100644
index 0000000..c5c540a
--- /dev/null
+++ b/frontend/src/api/auth.js
@@ -0,0 +1,19 @@
+import http from './client'
+
+/**
+ * 用户名密码登录
+ * @param {string} username
+ * @param {string} password
+ * @returns {Promise<{access_token:string, expires_in:number, user:{username:string, role:string, created_at:string}}>}
+ */
+export function login(username, password) {
+  return http.post('/api/v1/auth/login', { username, password })
+}
+
+/**
+ * 获取当前登录用户信息
+ * @returns {Promise<{username:string, role:string, created_at:string}>}
+ */
+export function me() {
+  return http.get('/api/v1/auth/me')
+}
diff --git a/frontend/src/api/client.js b/frontend/src/api/client.js
new file mode 100644
index 0000000..c1d6462
--- /dev/null
+++ b/frontend/src/api/client.js
@@ -0,0 +1,108 @@
+import axios from 'axios'
+import { message } from 'ant-design-vue'
+
+const TOKEN_STORAGE_KEY = 'qmd_token'
+
+/** 认证相关错误码：触发清 token + 跳登录 */
+const AUTH_ERROR_CODES = new Set([1003, 1005])
+
+const httpClient = axios.create({
+  // 不设 baseURL，使用相对路径，由 vite proxy / nginx 转发
+  timeout: 60000,
+  headers: {
+    'Content-Type': 'application/json'
+  }
+})
+
+// 请求拦截器：注入 Bearer token
+httpClient.interceptors.request.use((config) => {
+  const token = localStorage.getItem(TOKEN_STORAGE_KEY) || ''
+  if (token) {
+    config.headers = config.headers || {}
+    config.headers.Authorization = `Bearer ${token}`
+  }
+  return config
+})
+
+let unauthorizedHandler = null
+
+/**
+ * 注册 401 / 认证错误处理回调（由 router/store 注入，避免循环依赖）
+ * @param {() => void} handler
+ */
+export function setUnauthorizedHandler(handler) {
+  unauthorizedHandler = handler
+}
+
+function triggerUnauthorized() {
+  localStorage.removeItem(TOKEN_STORAGE_KEY)
+  if (typeof unauthorizedHandler === 'function') {
+    unauthorizedHandler()
+  }
+}
+
+// 响应拦截器：统一处理 code !== 0 与 401
+httpClient.interceptors.response.use(
+  (response) => {
+    const body = response.data
+    if (body && typeof body === 'object' && 'code' in body) {
+      if (body.code === 0) {
+        return body.data
+      }
+      // 业务错误
+      if (AUTH_ERROR_CODES.has(body.code)) {
+        triggerUnauthorized()
+      }
+      const err = new Error(body.message || '请求失败')
+      err.code = body.code
+      err.message = body.message || '请求失败'
+      return Promise.reject(err)
+    }
+    // 非标准结构，原样返回
+    return body
+  },
+  (error) => {
+    const status = error?.response?.status
+    if (status === 401) {
+      triggerUnauthorized()
+      const err = new Error('未认证或登录已过期，请重新登录')
+      err.code = 1003
+      return Promise.reject(err)
+    }
+    // 后端返回了 body 但 HTTP 错误
+    const body = error?.response?.data
+    if (body && typeof body === 'object' && 'code' in body) {
+      if (AUTH_ERROR_CODES.has(body.code)) {
+        triggerUnauthorized()
+      }
+      const err = new Error(body.message || `请求失败 (HTTP ${status ?? '?'})`)
+      err.code = body.code
+      return Promise.reject(err)
+    }
+    const err = new Error(error?.message || '网络请求失败')
+    err.code = `HTTP_${status ?? 'NETWORK'}`
+    return Promise.reject(err)
+  }
+)
+
+/**
+ * 统一发起请求，捕获异常并弹出 antd message
+ * @param {() => Promise<any>} fn
+ * @param {{ silent?: boolean, errorText?: string }} [options]
+ * @returns {Promise<any>}
+ */
+export async function callApi(fn, options = {}) {
+  const { silent = false, errorText = '操作失败' } = options
+  try {
+    return await fn()
+  } catch (err) {
+    const text = err?.message || errorText
+    if (!silent) {
+      message.error(text)
+    }
+    throw err
+  }
+}
+
+export { TOKEN_STORAGE_KEY }
+export default httpClient
diff --git a/frontend/src/api/documents.js b/frontend/src/api/documents.js
new file mode 100644
index 0000000..799b914
--- /dev/null
+++ b/frontend/src/api/documents.js
@@ -0,0 +1,62 @@
+import http from './client'
+
+/**
+ * 分页列出文档
+ * @param {number} [limit=20]
+ * @param {string|null} [offset=null]
+ * @returns {Promise<{items: Array, next_offset: string|null}>}
+ */
+export function list(limit = 20, offset = null) {
+  const params = { limit }
+  if (offset !== null && offset !== undefined && offset !== '') {
+    params.offset = offset
+  }
+  return http.get('/api/v1/documents', { params })
+}
+
+/**
+ * 获取文档详情
+ * @param {string} docId
+ * @returns {Promise<object>}
+ */
+export function detail(docId) {
+  return http.get(`/api/v1/documents/${encodeURIComponent(docId)}`)
+}
+
+/**
+ * 删除文档（幂等）
+ * @param {string} docId
+ * @returns {Promise<{doc_id:string, deleted: object, deleted_total:number}>}
+ */
+export function remove(docId) {
+  return http.delete(`/api/v1/documents/${encodeURIComponent(docId)}`)
+}
+
+/**
+ * JSON 文本入库（异步）
+ * @param {{title:string, source?:string, text:string, metadata?:object}} payload
+ * @returns {Promise<{task_id:string, status:string}>}
+ */
+export function ingest(payload) {
+  return http.post('/api/v1/documents', payload)
+}
+
+/**
+ * multipart 文件上传入库
+ * @param {FormData} formData
+ * @returns {Promise<{task_id:string, status:string, saved_path?:string}>}
+ */
+export function upload(formData) {
+  return http.post('/api/v1/documents/upload', formData, {
+    headers: { 'Content-Type': 'multipart/form-data' }
+  })
+}
+
+/**
+ * 查询入库任务状态
+ * @param {string} taskId
+ * @returns {Promise<object>}
+ */
+export function taskStatus(taskId) {
+  return http.get(`/api/v1/documents/tasks/${encodeURIComponent(taskId)}`)
+}
diff --git a/frontend/src/api/knowledge.js b/frontend/src/api/knowledge.js
new file mode 100644
index 0000000..a7d459b
--- /dev/null
+++ b/frontend/src/api/knowledge.js
@@ -0,0 +1,17 @@
+import http from './client'
+
+/**
+ * 获取知识分类类目集
+ * @returns {Promise<{categories: Array<{name:string, description:string}>, count: number}>}
+ */
+export function categories() {
+  return http.get('/api/v1/knowledge/categories')
+}
+
+/**
+ * 获取知识库统计（四层点数 + 类目分布 + uncategorized 数）
+ * @returns {Promise<{collections: {doc_l1:number, doc_l2:number, doc_l3:number, chunks:number}, documents_total:number, uncategorized_count:number, categories: Record<string, number>}>}
+ */
+export function stats() {
+  return http.get('/api/v1/knowledge/stats')
+}
diff --git a/frontend/src/api/search.js b/frontend/src/api/search.js
new file mode 100644
index 0000000..392d021
--- /dev/null
+++ b/frontend/src/api/search.js
@@ -0,0 +1,10 @@
+import http from './client'
+
+/**
+ * 分层检索
+ * @param {{query:string, top_k?:number, summarize?:boolean}} payload
+ * @returns {Promise<object>}
+ */
+export function search(payload) {
+  return http.post('/api/v1/search', payload)
+}
diff --git a/frontend/src/api/settings.js b/frontend/src/api/settings.js
new file mode 100644
index 0000000..2f17666
--- /dev/null
+++ b/frontend/src/api/settings.js
@@ -0,0 +1,34 @@
+import http from './client'
+
+/**
+ * 获取当前 RuntimeSettings
+ * @returns {Promise<object>}
+ */
+export function get() {
+  return http.get('/api/v1/settings')
+}
+
+/**
+ * 部分更新 RuntimeSettings（仅 admin）
+ * @param {{models?:object, parsers?:object, dedup?:object}} payload
+ * @returns {Promise<object>}
+ */
+export function update(payload) {
+  return http.put('/api/v1/settings', payload)
+}
+
+/**
+ * 获取可选项 schema
+ * @returns {Promise<{llm_providers:string[], pdf_plugins:string[], docx_plugins:string[], ocr_plugins:string[], dedup_strategies:string[]}>}
+ */
+export function schema() {
+  return http.get('/api/v1/settings/schema')
+}
+
+/**
+ * 重置为默认值（仅 admin）
+ * @returns {Promise<object>}
+ */
+export function reset() {
+  return http.post('/api/v1/settings/reset')
+}
diff --git a/frontend/src/composables/useIngestPolling.js b/frontend/src/composables/useIngestPolling.js
new file mode 100644
index 0000000..3fd7554
--- /dev/null
+++ b/frontend/src/composables/useIngestPolling.js
@@ -0,0 +1,93 @@
+import { onBeforeUnmount, reactive, ref } from 'vue'
+import { taskStatus } from '@/api/documents'
+import {
+  INGEST_POLL_INTERVAL_MS,
+  INGEST_POLL_MAX_ATTEMPTS,
+  INGEST_TERMINAL_STATUS
+} from '@/constants/ingest'
+
+/**
+ * 入库任务轮询 composable
+ *
+ * 调用 startPolling(taskId) 启动轮询；到达 done/failed/超时/出错 时自动停止并
+ * 写入 state。组件卸载时自动清理定时器。
+ *
+ * @returns {{
+ *   state: { taskId: string|null, task: object|null, status: string|null, error: object|null, isTimeout: boolean, isPolling: boolean },
+ *   startPolling: (taskId: string) => void,
+ *   stopPolling: () => void
+ * }}
+ */
+export function useIngestPolling() {
+  const state = reactive({
+    taskId: null,
+    task: null,
+    status: null,
+    error: null,
+    isTimeout: false,
+    isPolling: false
+  })
+
+  const timerRef = ref(null)
+  let attempts = 0
+
+  function stopPolling() {
+    if (timerRef.value !== null) {
+      clearInterval(timerRef.value)
+      timerRef.value = null
+    }
+    state.isPolling = false
+  }
+
+  function reset() {
+    stopPolling()
+    state.taskId = null
+    state.task = null
+    state.status = null
+    state.error = null
+    state.isTimeout = false
+    state.isPolling = false
+    attempts = 0
+  }
+
+  /**
+   * 启动轮询
+   * @param {string} taskId
+   */
+  function startPolling(taskId) {
+    reset()
+    state.taskId = taskId
+    state.isPolling = true
+    attempts = 0
+
+    timerRef.value = setInterval(async () => {
+      attempts += 1
+      if (attempts > INGEST_POLL_MAX_ATTEMPTS) {
+        stopPolling()
+        state.isTimeout = true
+        return
+      }
+      try {
+        const task = await taskStatus(taskId)
+        state.task = task
+        state.status = task?.status || null
+        if (INGEST_TERMINAL_STATUS.includes(task?.status)) {
+          stopPolling()
+        }
+      } catch (err) {
+        state.error = err
+        stopPolling()
+      }
+    }, INGEST_POLL_INTERVAL_MS)
+  }
+
+  onBeforeUnmount(() => {
+    stopPolling()
+  })
+
+  return {
+    state,
+    startPolling,
+    stopPolling
+  }
+}
diff --git a/frontend/src/constants/ingest.js b/frontend/src/constants/ingest.js
new file mode 100644
index 0000000..d044d07
--- /dev/null
+++ b/frontend/src/constants/ingest.js
@@ -0,0 +1,32 @@
+/**
+ * 入库任务状态映射：后端 status → 中文展示
+ */
+export const INGEST_STATUS_TEXT = Object.freeze({
+  pending: '排队中',
+  summarizing: '总结中',
+  classifying: '分类中',
+  embedding: '向量化中',
+  writing: '写入中',
+  done: '完成',
+  failed: '失败'
+})
+
+/** 轮询间隔（毫秒） */
+export const INGEST_POLL_INTERVAL_MS = 2000
+
+/** 轮询最大次数：150 次 × 2s = 5 分钟超时 */
+export const INGEST_POLL_MAX_ATTEMPTS = 150
+
+/** 入库状态徽标颜色映射（antd Badge / Tag 状态） */
+export const INGEST_STATUS_COLOR = Object.freeze({
+  pending: 'default',
+  summarizing: 'processing',
+  classifying: 'processing',
+  embedding: 'processing',
+  writing: 'processing',
+  done: 'success',
+  failed: 'error'
+})
+
+/** 终态集合：到达这些状态后停止轮询 */
+export const INGEST_TERMINAL_STATUS = Object.freeze(['done', 'failed'])
diff --git a/frontend/src/layouts/MainLayout.vue b/frontend/src/layouts/MainLayout.vue
new file mode 100644
index 0000000..9da7e80
--- /dev/null
+++ b/frontend/src/layouts/MainLayout.vue
@@ -0,0 +1,232 @@
+<script setup>
+import { computed, h, ref } from 'vue'
+import { useRoute, useRouter, RouterView } from 'vue-router'
+import { storeToRefs } from 'pinia'
+import { Modal } from 'ant-design-vue'
+import {
+  DashboardOutlined,
+  FileTextOutlined,
+  UploadOutlined,
+  SearchOutlined,
+  AppstoreOutlined,
+  SettingOutlined,
+  MenuFoldOutlined,
+  MenuUnfoldOutlined,
+  LogoutOutlined,
+  DatabaseOutlined
+} from '@ant-design/icons-vue'
+import { useAuthStore } from '@/stores/useAuthStore'
+
+const route = useRoute()
+const router = useRouter()
+const authStore = useAuthStore()
+const { user, displayName } = storeToRefs(authStore)
+
+const collapsed = ref(false)
+
+const selectedKeys = computed(() => {
+  return [route.name ? String(route.name) : '']
+})
+
+const openKeys = ref(['main'])
+
+const menuItems = [
+  { key: 'overview', icon: () => h(DashboardOutlined), label: '概览' },
+  { key: 'documents', icon: () => h(FileTextOutlined), label: '文档管理' },
+  { key: 'ingest', icon: () => h(UploadOutlined), label: '文档入库' },
+  { key: 'search', icon: () => h(SearchOutlined), label: '检索测试台' },
+  { key: 'categories', icon: () => h(AppstoreOutlined), label: '类目列表' },
+  { key: 'settings', icon: () => h(SettingOutlined), label: '设置' }
+]
+
+function handleMenuClick({ key }) {
+  if (key && key !== route.name) {
+    router.push({ name: key })
+  }
+}
+
+function handleLogout() {
+  Modal.confirm({
+    title: '确认登出',
+    content: '确定要退出登录吗？',
+    okText: '登出',
+    cancelText: '取消',
+    onOk() {
+      authStore.logout()
+      router.replace({ name: 'login' })
+    }
+  })
+}
+</script>
+
+<template>
+  <a-layout class="main-layout">
+    <a-layout-sider
+      v-model:collapsed="collapsed"
+      collapsible
+      :trigger="null"
+      breakpoint="lg"
+      class="main-layout__sider"
+    >
+      <div class="main-layout__logo">
+        <span class="main-layout__logo-icon">
+          <DatabaseOutlined />
+        </span>
+        <span v-if="!collapsed" class="main-layout__logo-text">QMDSearch</span>
+      </div>
+      <a-menu
+        theme="dark"
+        mode="inline"
+        :selected-keys="selectedKeys"
+        :open-keys="openKeys"
+        :items="menuItems"
+        @click="handleMenuClick"
+      />
+    </a-layout-sider>
+
+    <a-layout>
+      <a-layout-header class="main-layout__header">
+        <a-button
+          type="text"
+          class="main-layout__collapse"
+          @click="collapsed = !collapsed"
+        >
+          <MenuUnfoldOutlined v-if="collapsed" />
+          <MenuFoldOutlined v-else />
+        </a-button>
+        <div class="main-layout__title">知识库管理后台</div>
+        <div class="main-layout__user">
+          <span class="main-layout__user-name">{{ displayName }}</span>
+          <a-divider type="vertical" />
+          <a-button
+            type="text"
+            size="small"
+            class="main-layout__logout"
+            @click="handleLogout"
+          >
+            <template #icon><LogoutOutlined /></template>
+            登出
+          </a-button>
+        </div>
+      </a-layout-header>
+
+      <a-layout-content class="main-layout__content">
+        <RouterView />
+      </a-layout-content>
+
+      <a-layout-footer class="main-layout__footer">
+        QMDSearch Admin · 当前用户：{{ user?.username || '-' }}
+      </a-layout-footer>
+    </a-layout>
+  </a-layout>
+</template>
+
+<style scoped>
+.main-layout {
+  min-height: 100vh;
+}
+
+.main-layout__sider {
+  position: sticky;
+  top: 0;
+  height: 100vh;
+  overflow: auto;
+  box-shadow: 2px 0 8px rgba(0, 21, 41, 0.15);
+}
+
+.main-layout__logo {
+  height: 52px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 10px;
+  padding: 0 16px;
+  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
+  background: linear-gradient(135deg, #001529 0%, #002140 100%);
+}
+
+.main-layout__logo-icon {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 28px;
+  height: 28px;
+  border-radius: 6px;
+  background: linear-gradient(135deg, #1677ff 0%, #4096ff 100%);
+  color: #fff;
+  font-size: 16px;
+  box-shadow: 0 2px 6px rgba(22, 119, 255, 0.4);
+}
+
+.main-layout__logo-text {
+  color: #fff;
+  font-size: 17px;
+  font-weight: 700;
+  letter-spacing: 0.5px;
+  white-space: nowrap;
+}
+
+.main-layout__header {
+  display: flex;
+  align-items: center;
+  background: #fff;
+  padding: 0 20px;
+  height: 52px;
+  line-height: 52px;
+  box-shadow: 0 1px 4px rgba(0, 21, 41, 0.08);
+  z-index: 10;
+}
+
+.main-layout__collapse {
+  flex: 0 0 auto;
+  font-size: 16px;
+  color: #4b5563;
+}
+
+.main-layout__collapse:hover {
+  color: #1677ff;
+}
+
+.main-layout__title {
+  flex: 1 1 auto;
+  margin-left: 12px;
+  font-size: 16px;
+  font-weight: 600;
+  color: #1f2937;
+}
+
+.main-layout__user {
+  flex: 0 0 auto;
+  display: flex;
+  align-items: center;
+  gap: 4px;
+}
+
+.main-layout__user-name {
+  color: #4b5563;
+  font-size: 13px;
+}
+
+.main-layout__logout {
+  color: #6b7280;
+}
+
+.main-layout__logout:hover {
+  color: #ff4d4f;
+}
+
+.main-layout__content {
+  margin: 16px;
+  padding: 0;
+  background: transparent;
+  overflow: auto;
+}
+
+.main-layout__footer {
+  text-align: center;
+  color: #6b7280;
+  font-size: 12px;
+  background: transparent;
+  padding: 12px 16px;
+}
+</style>
diff --git a/frontend/src/main.js b/frontend/src/main.js
new file mode 100644
index 0000000..2aebfdb
--- /dev/null
+++ b/frontend/src/main.js
@@ -0,0 +1,30 @@
+import { createApp } from 'vue'
+import { createPinia } from 'pinia'
+import Antd from 'ant-design-vue'
+import 'ant-design-vue/dist/reset.css'
+import App from './App.vue'
+import router from './router'
+import { setUnauthorizedHandler } from './api/client'
+import { useAuthStore } from './stores/useAuthStore'
+import './styles/main.css'
+
+const app = createApp(App)
+const pinia = createPinia()
+
+app.use(pinia)
+
+// 注册 401 处理：清 store + 跳 /login
+const authStore = useAuthStore()
+setUnauthorizedHandler(() => {
+  authStore.clearAuth()
+  if (router.currentRoute.value.name !== 'login') {
+    router.replace({
+      name: 'login',
+      query: { redirect: router.currentRoute.value.fullPath }
+    })
+  }
+})
+
+app.use(router)
+app.use(Antd)
+app.mount('#app')
diff --git a/frontend/src/router/index.js b/frontend/src/router/index.js
new file mode 100644
index 0000000..aef30c3
--- /dev/null
+++ b/frontend/src/router/index.js
@@ -0,0 +1,91 @@
+import { createRouter, createWebHistory } from 'vue-router'
+import { useAuthStore } from '@/stores/useAuthStore'
+
+const routes = [
+  {
+    path: '/login',
+    name: 'login',
+    component: () => import('@/views/Login.vue'),
+    meta: { title: '登录', requiresAuth: false }
+  },
+  {
+    path: '/',
+    component: () => import('@/layouts/MainLayout.vue'),
+    redirect: '/overview',
+    meta: { requiresAuth: true },
+    children: [
+      {
+        path: 'overview',
+        name: 'overview',
+        component: () => import('@/views/Overview.vue'),
+        meta: { title: '概览', requiresAuth: true }
+      },
+      {
+        path: 'documents',
+        name: 'documents',
+        component: () => import('@/views/Documents.vue'),
+        meta: { title: '文档管理', requiresAuth: true }
+      },
+      {
+        path: 'ingest',
+        name: 'ingest',
+        component: () => import('@/views/Ingest.vue'),
+        meta: { title: '文档入库', requiresAuth: true }
+      },
+      {
+        path: 'search',
+        name: 'search',
+        component: () => import('@/views/Search.vue'),
+        meta: { title: '检索测试台', requiresAuth: true }
+      },
+      {
+        path: 'categories',
+        name: 'categories',
+        component: () => import('@/views/Categories.vue'),
+        meta: { title: '类目列表', requiresAuth: true }
+      },
+      {
+        path: 'settings',
+        name: 'settings',
+        component: () => import('@/views/Settings.vue'),
+        meta: { title: '设置', requiresAuth: true }
+      }
+    ]
+  },
+  {
+    path: '/:pathMatch(.*)*',
+    name: 'not-found',
+    redirect: '/overview'
+  }
+]
+
+const router = createRouter({
+  history: createWebHistory('/admin/'),
+  routes,
+  scrollBehavior() {
+    return { top: 0 }
+  }
+})
+
+// 全局前置守卫：未登录跳 /login；已登录访问 /login 跳 /overview
+router.beforeEach((to) => {
+  const authStore = useAuthStore()
+  const title = to.meta?.title
+  if (title) {
+    document.title = `${title} - QMDSearch 知识库后台`
+  } else {
+    document.title = 'QMDSearch 知识库后台'
+  }
+
+  if (to.meta?.requiresAuth && !authStore.isAuthenticated) {
+    return { name: 'login', query: { redirect: to.fullPath } }
+  }
+
+  if (to.name === 'login' && authStore.isAuthenticated) {
+    return { name: 'overview' }
+  }
+
+  return true
+})
+
+export default router
diff --git a/frontend/src/stores/useAuthStore.js b/frontend/src/stores/useAuthStore.js
new file mode 100644
index 0000000..b29d71a
--- /dev/null
+++ b/frontend/src/stores/useAuthStore.js
@@ -0,0 +1,66 @@
+import { defineStore } from 'pinia'
+
+const TOKEN_STORAGE_KEY = 'qmd_token'
+const USER_STORAGE_KEY = 'qmd_user'
+
+/**
+ * 从 localStorage 读取用户信息
+ * @returns {{username:string, role:string, created_at?:string} | null}
+ */
+function loadUserFromStorage() {
+  try {
+    const raw = localStorage.getItem(USER_STORAGE_KEY)
+    if (!raw) return null
+    const parsed = JSON.parse(raw)
+    if (parsed && typeof parsed === 'object' && parsed.username) {
+      return parsed
+    }
+    return null
+  } catch {
+    return null
+  }
+}
+
+export const useAuthStore = defineStore('auth', {
+  state: () => ({
+    token: localStorage.getItem(TOKEN_STORAGE_KEY) || '',
+    user: loadUserFromStorage()
+  }),
+
+  getters: {
+    isAuthenticated: (state) => Boolean(state.token),
+    isAdmin: (state) => state.user?.role === 'admin',
+    displayName: (state) => {
+      if (!state.user) return ''
+      return `${state.user.username} (${state.user.role})`
+    }
+  },
+
+  actions: {
+    /**
+     * 登录成功后保存 token + user
+     * @param {{access_token:string, user:object}} data
+     */
+    setAuth(data) {
+      this.token = data.access_token
+      this.user = data.user
+      localStorage.setItem(TOKEN_STORAGE_KEY, data.access_token)
+      localStorage.setItem(USER_STORAGE_KEY, JSON.stringify(data.user))
+    },
+
+    /** 清除登录态（登出 / 401） */
+    clearAuth() {
+      this.token = ''
+      this.user = null
+      localStorage.removeItem(TOKEN_STORAGE_KEY)
+      localStorage.removeItem(USER_STORAGE_KEY)
+    },
+
+    /**
+     * 登出
+     */
+    logout() {
+      this.clearAuth()
+    }
+  }
+})
diff --git a/frontend/src/styles/main.css b/frontend/src/styles/main.css
new file mode 100644
index 0000000..57bc520
--- /dev/null
+++ b/frontend/src/styles/main.css
@@ -0,0 +1,79 @@
+html,
+body,
+#app {
+  height: 100%;
+  margin: 0;
+  padding: 0;
+}
+
+#app {
+  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei',
+    'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
+  color: #1f2937;
+  background: #f0f2f5;
+}
+
+/* 统一文本工具类 */
+.text-muted {
+  color: #6b7280;
+  font-size: 12px;
+}
+
+.text-break {
+  word-break: break-word;
+  white-space: pre-wrap;
+}
+
+/* 页面通用 section 容器 */
+.page-section {
+  background: #fff;
+  border-radius: 8px;
+  padding: 20px 24px;
+  box-shadow: 0 1px 2px rgba(0, 21, 41, 0.04);
+}
+
+/* flex-gap：横排卡片/标签 */
+.flex-gap {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 12px;
+}
+
+.toolbar {
+  margin: 12px 0;
+}
+
+/* 统一页面标题样式 */
+.page-title {
+  font-size: 18px;
+  font-weight: 600;
+  margin: 0;
+  color: #1f2937;
+}
+
+/* 统一卡片标题样式 */
+.section-subtitle {
+  font-size: 14px;
+  font-weight: 600;
+  color: #374151;
+  margin: 16px 0 12px;
+}
+
+/* 滚动条美化 */
+::-webkit-scrollbar {
+  width: 8px;
+  height: 8px;
+}
+
+::-webkit-scrollbar-thumb {
+  background: rgba(0, 0, 0, 0.2);
+  border-radius: 4px;
+}
+
+::-webkit-scrollbar-thumb:hover {
+  background: rgba(0, 0, 0, 0.35);
+}
+
+::-webkit-scrollbar-track {
+  background: transparent;
+}
diff --git a/frontend/src/utils/format.js b/frontend/src/utils/format.js
new file mode 100644
index 0000000..a8f8e3d
--- /dev/null
+++ b/frontend/src/utils/format.js
@@ -0,0 +1,38 @@
+/**
+ * 截断文本，超过最大长度追加省略号
+ * @param {string} text
+ * @param {number} [maxLen=80]
+ * @returns {string}
+ */
+export function truncate(text, maxLen = 80) {
+  if (!text) return ''
+  const s = String(text)
+  return s.length > maxLen ? `${s.slice(0, maxLen)}…` : s
+}
+
+/**
+ * 安全拼接类名
+ * @param  {...(string | false | null | undefined)} args
+ * @returns {string}
+ */
+export function classnames(...args) {
+  return args.filter(Boolean).join(' ')
+}
+
+/**
+ * 防抖
+ * @param {Function} fn
+ * @param {number} [wait=300]
+ * @returns {Function}
+ */
+export function debounce(fn, wait = 300) {
+  let timer = null
+  return function debounced(...args) {
+    if (timer) {
+      clearTimeout(timer)
+    }
+    timer = setTimeout(() => {
+      fn.apply(this, args)
+    }, wait)
+  }
+}
diff --git a/frontend/src/views/Categories.vue b/frontend/src/views/Categories.vue
new file mode 100644
index 0000000..ae1e23b
--- /dev/null
+++ b/frontend/src/views/Categories.vue
@@ -0,0 +1,70 @@
+<script setup>
+import { onMounted, ref } from 'vue'
+import { message } from 'ant-design-vue'
+import { categories as fetchCategories } from '@/api/knowledge'
+
+const isLoading = ref(false)
+const categoriesData = ref([])
+
+const columns = [
+  { title: '名称', dataIndex: 'name', key: 'name' },
+  { title: '描述', dataIndex: 'description', key: 'description' }
+]
+
+async function loadCategories() {
+  isLoading.value = true
+  try {
+    const data = await fetchCategories()
+    categoriesData.value = data.categories || []
+  } catch (err) {
+    message.error(err?.message || '加载类目列表失败')
+  } finally {
+    isLoading.value = false
+  }
+}
+
+onMounted(() => {
+  loadCategories()
+})
+</script>
+
+<template>
+  <div class="categories page-section">
+    <div class="categories__header">
+      <h2 class="categories__title">类目列表</h2>
+      <a-button :loading="isLoading" @click="loadCategories">刷新</a-button>
+    </div>
+
+    <a-table
+      :columns="columns"
+      :data-source="categoriesData"
+      :pagination="false"
+      :loading="isLoading"
+      row-key="name"
+      size="small"
+    >
+      <template #bodyCell="{ column, record }">
+        <template v-if="column.key === 'name'">
+          <a-tag color="blue">{{ record.name }}</a-tag>
+        </template>
+        <template v-else-if="column.key === 'description'">
+          <span>{{ record.description || '-' }}</span>
+        </template>
+      </template>
+    </a-table>
+  </div>
+</template>
+
+<style scoped>
+.categories__header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 12px;
+}
+
+.categories__title {
+  font-size: 16px;
+  margin: 0;
+}
+</style>
diff --git a/frontend/src/views/Documents.vue b/frontend/src/views/Documents.vue
new file mode 100644
index 0000000..d840d45
--- /dev/null
+++ b/frontend/src/views/Documents.vue
@@ -0,0 +1,299 @@
+<script setup>
+import { onMounted, reactive, ref } from 'vue'
+import { message, Modal } from 'ant-design-vue'
+import {
+  list as fetchDocuments,
+  detail as fetchDocumentDetail,
+  remove as deleteDocument
+} from '@/api/documents'
+import { truncate } from '@/utils/format'
+
+const isLoading = ref(false)
+const isLoadingDetail = ref(false)
+const isDeleting = ref(false)
+
+const documents = ref([])
+const nextOffset = ref(null)
+
+const detailVisible = ref(false)
+const detailData = ref(null)
+
+const statusText = reactive({
+  text: ''
+})
+
+function updateStatusText() {
+  statusText.text =
+    nextOffset.value === null ? '已加载全部' : '还有更多，可继续加载'
+}
+
+async function loadDocuments(reset = false) {
+  isLoading.value = true
+  try {
+    const offset = reset ? null : nextOffset.value
+    const data = await fetchDocuments(20, offset)
+    if (reset) {
+      documents.value = data.items || []
+    } else {
+      documents.value = documents.value.concat(data.items || [])
+    }
+    nextOffset.value = data.next_offset ?? null
+    updateStatusText()
+  } catch (err) {
+    message.error(err?.message || '加载文档列表失败')
+  } finally {
+    isLoading.value = false
+  }
+}
+
+async function handleLoadMore() {
+  await loadDocuments(false)
+}
+
+function handleViewDetail(docId) {
+  detailVisible.value = true
+  detailData.value = null
+  loadDocDetail(docId)
+}
+
+async function loadDocDetail(docId) {
+  isLoadingDetail.value = true
+  try {
+    detailData.value = await fetchDocumentDetail(docId)
+  } catch (err) {
+    message.error(err?.message || '加载文档详情失败')
+  } finally {
+    isLoadingDetail.value = false
+  }
+}
+
+function handleDelete(doc) {
+  const title = doc.title || doc.doc_id
+  Modal.confirm({
+    title: '确认删除',
+    content: `确定删除文档「${title}」(${doc.doc_id}) 吗？该操作将删除四层集合中的全部数据，不可恢复。`,
+    okText: '删除',
+    okType: 'danger',
+    cancelText: '取消',
+    async onOk() {
+      isDeleting.value = true
+      try {
+        const data = await deleteDocument(doc.doc_id)
+        message.success(`已删除 ${data.deleted_total ?? 0} 条数据`)
+        detailVisible.value = false
+        await loadDocuments(true)
+      } catch (err) {
+        message.error(err?.message || '删除文档失败')
+      } finally {
+        isDeleting.value = false
+      }
+    }
+  })
+}
+
+function handleCloseDetail() {
+  detailVisible.value = false
+  detailData.value = null
+}
+
+const columns = [
+  { title: '标题', dataIndex: 'title', key: 'title', ellipsis: true },
+  { title: '类目', dataIndex: 'category', key: 'category', width: 140 },
+  { title: '标签', dataIndex: 'tags', key: 'tags', width: 220 },
+  { title: 'L1 摘要', dataIndex: 'summary', key: 'summary', ellipsis: true },
+  { title: '操作', key: 'action', width: 160, fixed: 'right' }
+]
+
+function getDocTitle(record) {
+  return record?.title || '(无标题)'
+}
+
+onMounted(() => {
+  loadDocuments(true)
+})
+</script>
+
+<template>
+  <div class="documents page-section">
+    <div class="documents__header">
+      <h2 class="documents__title">文档管理</h2>
+    </div>
+
+    <a-table
+      :columns="columns"
+      :data-source="documents"
+      :pagination="false"
+      :loading="isLoading"
+      row-key="doc_id"
+      size="small"
+      :scroll="{ x: 900 }"
+    >
+      <template #bodyCell="{ column, record }">
+        <template v-if="column.key === 'title'">
+          <span :title="record.title">{{ getDocTitle(record) }}</span>
+        </template>
+        <template v-else-if="column.key === 'category'">
+          <a-tag v-if="record.category" color="blue">{{ record.category }}</a-tag>
+          <span v-else class="text-muted">-</span>
+        </template>
+        <template v-else-if="column.key === 'tags'">
+          <template v-if="record.tags && record.tags.length">
+            <a-tag v-for="tag in record.tags" :key="tag">{{ tag }}</a-tag>
+          </template>
+          <span v-else class="text-muted">-</span>
+        </template>
+        <template v-else-if="column.key === 'summary'">
+          <span :title="record.summary">{{ truncate(record.summary, 80) }}</span>
+        </template>
+        <template v-else-if="column.key === 'action'">
+          <a-space>
+            <a-button type="link" size="small" @click="handleViewDetail(record.doc_id)">
+              详情
+            </a-button>
+            <a-button
+              type="link"
+              size="small"
+              danger
+              :loading="isDeleting"
+              @click="handleDelete(record)"
+            >
+              删除
+            </a-button>
+          </a-space>
+        </template>
+      </template>
+    </a-table>
+
+    <div class="toolbar documents__toolbar">
+      <a-button
+        :loading="isLoading"
+        :disabled="nextOffset === null"
+        @click="handleLoadMore"
+      >
+        加载更多
+      </a-button>
+      <span class="text-muted" style="margin-left: 12px">{{ statusText.text }}</span>
+    </div>
+
+    <a-drawer
+      :open="detailVisible"
+      title="文档详情"
+      placement="right"
+      width="640"
+      :destroy-on-close="true"
+      @close="handleCloseDetail"
+    >
+      <a-spin :spinning="isLoadingDetail">
+        <div v-if="detailData">
+          <a-descriptions :column="1" size="small" bordered>
+            <a-descriptions-item label="doc_id">
+              {{ detailData.l1?.doc_id || '-' }}
+            </a-descriptions-item>
+            <a-descriptions-item label="标题">
+              {{ detailData.l1?.title || '-' }}
+            </a-descriptions-item>
+            <a-descriptions-item label="类目">
+              {{ detailData.l1?.category || '-' }}
+            </a-descriptions-item>
+            <a-descriptions-item label="标签">
+              <template v-if="detailData.l1?.tags && detailData.l1.tags.length">
+                <a-tag v-for="tag in detailData.l1.tags" :key="tag">{{ tag }}</a-tag>
+              </template>
+              <span v-else class="text-muted">-</span>
+            </a-descriptions-item>
+            <a-descriptions-item label="chunks_count">
+              {{ detailData.chunks_count ?? 0 }}
+            </a-descriptions-item>
+          </a-descriptions>
+
+          <h3 class="documents__section-title">L1 全文</h3>
+          <pre class="documents__pre">{{ detailData.l1?.text || '' }}</pre>
+
+          <h3 class="documents__section-title">
+            L2 节点（{{ (detailData.l2_nodes || []).length }}）
+          </h3>
+          <div v-if="(detailData.l2_nodes || []).length === 0" class="text-muted">无</div>
+          <div
+            v-for="(node, idx) in detailData.l2_nodes || []"
+            :key="`l2-${idx}`"
+            class="documents__node"
+          >
+            <div class="documents__node-path">{{ node.section_path || '' }}</div>
+            <div class="documents__node-text text-break">{{ node.text || '' }}</div>
+          </div>
+
+          <h3 class="documents__section-title">
+            L3 节点（{{ (detailData.l3_nodes || []).length }}）
+          </h3>
+          <div v-if="(detailData.l3_nodes || []).length === 0" class="text-muted">无</div>
+          <div
+            v-for="(node, idx) in detailData.l3_nodes || []"
+            :key="`l3-${idx}`"
+            class="documents__node"
+          >
+            <div class="documents__node-path">{{ node.section_path || '' }}</div>
+            <div class="documents__node-text text-break">{{ node.text || '' }}</div>
+          </div>
+        </div>
+        <div v-else-if="!isLoadingDetail" class="text-muted">暂无数据</div>
+      </a-spin>
+    </a-drawer>
+  </div>
+</template>
+
+<style scoped>
+.documents__header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 12px;
+}
+
+.documents__title {
+  font-size: 16px;
+  margin: 0;
+}
+
+.documents__toolbar {
+  display: flex;
+  align-items: center;
+}
+
+.documents__section-title {
+  font-size: 14px;
+  margin: 16px 0 8px;
+  color: #374151;
+}
+
+.documents__pre {
+  background: #f9fafb;
+  border: 1px solid #e5e7eb;
+  border-radius: 4px;
+  padding: 8px;
+  white-space: pre-wrap;
+  word-break: break-word;
+  font-size: 12px;
+  max-height: 260px;
+  overflow: auto;
+  margin: 0;
+}
+
+.documents__node {
+  border-left: 3px solid #93c5fd;
+  padding: 6px 10px;
+  margin-bottom: 6px;
+  background: #f8fafc;
+  border-radius: 0 4px 4px 0;
+}
+
+.documents__node-path {
+  font-size: 12px;
+  color: #6b7280;
+  margin-bottom: 4px;
+}
+
+.documents__node-text {
+  font-size: 13px;
+  color: #1f2937;
+}
+</style>
diff --git a/frontend/src/views/Ingest.vue b/frontend/src/views/Ingest.vue
new file mode 100644
index 0000000..d29516a
--- /dev/null
+++ b/frontend/src/views/Ingest.vue
@@ -0,0 +1,352 @@
+<script setup>
+import { computed, reactive, ref } from 'vue'
+import { message } from 'ant-design-vue'
+import { ingest as ingestDocument, upload as uploadDocument } from '@/api/documents'
+import { useIngestPolling } from '@/composables/useIngestPolling'
+import {
+  INGEST_STATUS_TEXT,
+  INGEST_STATUS_COLOR
+} from '@/constants/ingest'
+
+const { state: pollState, startPolling, stopPolling } = useIngestPolling()
+
+const activeTab = ref('text')
+
+const isSubmittingText = ref(false)
+const isSubmittingFile = ref(false)
+
+const textFormRef = ref(null)
+const textForm = reactive({
+  title: '',
+  source: '',
+  text: ''
+})
+
+const textRules = {
+  title: [{ required: true, message: '请输入标题', trigger: 'blur' }],
+  text: [{ required: true, message: '请输入正文', trigger: 'blur' }]
+}
+
+const fileForm = reactive({
+  title: '',
+  source: ''
+})
+const fileList = ref([])
+const rawFile = ref(null)
+
+const ACCEPTED_EXTENSIONS = '.txt,.md,.html,.htm,.pdf,.docx'
+
+const statusBadgeColor = computed(() => {
+  return INGEST_STATUS_COLOR[pollState.status] || 'default'
+})
+
+const statusBadgeText = computed(() => {
+  return INGEST_STATUS_TEXT[pollState.status] || pollState.status || '-'
+})
+
+const isTerminal = computed(() =>
+  ['done', 'failed'].includes(pollState.status)
+)
+
+const resultData = computed(() => pollState.task?.result || null)
+const errorData = computed(() => pollState.task?.error || pollState.error || null)
+const summaryData = computed(() => resultData.value?.summary || {})
+const partialSummary = computed(() => errorData.value?.partial_summary || null)
+
+function handleFileChange(file) {
+  // a-upload before-upload 返回 false 表示不自动上传；保存原始 File 供 FormData 使用
+  rawFile.value = file
+  fileList.value = [file]
+  return false
+}
+
+function handleFileRemove() {
+  rawFile.value = null
+  fileList.value = []
+}
+
+async function handleSubmitText() {
+  try {
+    await textFormRef.value.validate()
+  } catch {
+    return
+  }
+  isSubmittingText.value = true
+  try {
+    const payload = {
+      title: textForm.title,
+      text: textForm.text
+    }
+    if (textForm.source) {
+      payload.source = textForm.source
+    }
+    const data = await ingestDocument(payload)
+    message.success('任务已提交')
+    startPolling(data.task_id)
+  } catch (err) {
+    message.error(err?.message || '提交入库失败')
+  } finally {
+    isSubmittingText.value = false
+  }
+}
+
+async function handleSubmitFile() {
+  if (!rawFile.value) {
+    message.warning('请选择文件')
+    return
+  }
+  isSubmittingFile.value = true
+  try {
+    const formData = new FormData()
+    formData.append('file', rawFile.value)
+    if (fileForm.title) {
+      formData.append('title', fileForm.title)
+    }
+    if (fileForm.source) {
+      formData.append('source', fileForm.source)
+    }
+    const data = await uploadDocument(formData)
+    message.success('任务已提交')
+    startPolling(data.task_id)
+  } catch (err) {
+    message.error(err?.message || '上传入库失败')
+  } finally {
+    isSubmittingFile.value = false
+  }
+}
+
+function handleCancelPolling() {
+  stopPolling()
+  message.info('已停止轮询')
+}
+</script>
+
+<template>
+  <div class="ingest page-section">
+    <div class="ingest__header">
+      <h2 class="ingest__title">文档入库</h2>
+    </div>
+
+    <a-tabs v-model:activeKey="activeTab">
+      <a-tab-pane key="text" tab="文本入库">
+        <a-form
+          ref="textFormRef"
+          :model="textForm"
+          :rules="textRules"
+          layout="vertical"
+        >
+          <a-form-item label="标题" name="title">
+            <a-input v-model:value="textForm.title" placeholder="请输入标题" allow-clear />
+          </a-form-item>
+          <a-form-item label="来源" name="source">
+            <a-input
+              v-model:value="textForm.source"
+              placeholder="例如：manual / web / file"
+              allow-clear
+            />
+          </a-form-item>
+          <a-form-item label="正文" name="text">
+            <a-textarea
+              v-model:value="textForm.text"
+              placeholder="请输入文档正文"
+              :auto-size="{ minRows: 8, maxRows: 18 }"
+            />
+          </a-form-item>
+          <a-form-item>
+            <a-button
+              type="primary"
+              :loading="isSubmittingText || pollState.isPolling"
+              @click="handleSubmitText"
+            >
+              提交入库
+            </a-button>
+          </a-form-item>
+        </a-form>
+      </a-tab-pane>
+
+      <a-tab-pane key="file" tab="文件上传">
+        <a-form
+          :model="fileForm"
+          layout="vertical"
+        >
+          <a-form-item label="选择文件">
+            <a-upload
+              :file-list="fileList"
+              :accept="ACCEPTED_EXTENSIONS"
+              :max-count="1"
+              :before-upload="handleFileChange"
+              @remove="handleFileRemove"
+            >
+              <a-button :disabled="fileList.length >= 1">选择文件</a-button>
+            </a-upload>
+            <div class="text-muted" style="margin-top: 4px">
+              支持 .txt/.md/.html/.htm/.pdf/.docx
+            </div>
+          </a-form-item>
+          <a-form-item label="标题（可选，默认取文件名）" name="title">
+            <a-input
+              v-model:value="fileForm.title"
+              placeholder="留空则使用文件名去扩展"
+              allow-clear
+            />
+          </a-form-item>
+          <a-form-item label="来源（可选，默认 file:原文件名）" name="source">
+            <a-input
+              v-model:value="fileForm.source"
+              placeholder="例如：manual / web"
+              allow-clear
+            />
+          </a-form-item>
+          <a-form-item>
+            <a-button
+              type="primary"
+              :loading="isSubmittingFile || pollState.isPolling"
+              @click="handleSubmitFile"
+            >
+              上传入库
+            </a-button>
+          </a-form-item>
+        </a-form>
+      </a-tab-pane>
+    </a-tabs>
+
+    <div v-if="pollState.taskId" class="ingest__result">
+      <div class="ingest__result-header">
+        <span>任务已提交：{{ pollState.taskId }}</span>
+        <a-tag :color="statusBadgeColor">{{ statusBadgeText }}</a-tag>
+        <a-button
+          v-if="pollState.isPolling"
+          type="link"
+          size="small"
+          @click="handleCancelPolling"
+        >
+          停止轮询
+        </a-button>
+      </div>
+
+      <a-alert
+        v-if="pollState.isTimeout"
+        class="ingest__alert"
+        type="warning"
+        show-icon
+        :message="`任务仍在进行，可稍后凭 task_id 查询：${pollState.taskId}`"
+      />
+
+      <a-alert
+        v-if="pollState.error && !pollState.task"
+        class="ingest__alert"
+        type="error"
+        show-icon
+        :message="pollState.error?.message || '轮询失败'"
+      />
+
+      <div v-if="isTerminal && pollState.status === 'done' && resultData" class="ingest__done">
+        <a-descriptions :column="1" size="small" bordered>
+          <a-descriptions-item label="document_id">
+            {{ resultData.document_id || '-' }}
+          </a-descriptions-item>
+          <a-descriptions-item label="类目">
+            {{ resultData.category || '-' }}（置信度 {{ resultData.category_confidence ?? '-' }}）
+          </a-descriptions-item>
+          <a-descriptions-item label="标签">
+            <template v-if="resultData.tags && resultData.tags.length">
+              <a-tag v-for="tag in resultData.tags" :key="tag">{{ tag }}</a-tag>
+            </template>
+            <span v-else class="text-muted">-</span>
+          </a-descriptions-item>
+          <a-descriptions-item label="总结层级">
+            {{ summaryData.level ?? '-' }}
+          </a-descriptions-item>
+          <a-descriptions-item label="写入集合">
+            {{ resultData.collection || '-' }}
+          </a-descriptions-item>
+          <a-descriptions-item label="chunks_count">
+            {{ resultData.chunks_count ?? 0 }}
+          </a-descriptions-item>
+        </a-descriptions>
+        <h3 class="ingest__section-title">L1 总结</h3>
+        <pre class="ingest__pre">{{ summaryData.l1_summary || '' }}</pre>
+      </div>
+
+      <div v-if="isTerminal && pollState.status === 'failed'" class="ingest__failed">
+        <a-descriptions :column="1" size="small" bordered>
+          <a-descriptions-item label="失败阶段">
+            {{ errorData?.stage || '-' }}
+          </a-descriptions-item>
+          <a-descriptions-item label="错误信息">
+            <span class="text-break">{{ errorData?.message || '-' }}</span>
+          </a-descriptions-item>
+        </a-descriptions>
+        <template v-if="partialSummary && partialSummary.l1_summary">
+          <a-alert
+            class="ingest__alert"
+            type="info"
+            show-icon
+            message="已产出总结保留：任务失败前已生成 L1 摘要"
+          />
+          <h3 class="ingest__section-title">L1 总结</h3>
+          <pre class="ingest__pre">{{ partialSummary.l1_summary }}</pre>
+        </template>
+      </div>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.ingest__header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 12px;
+}
+
+.ingest__title {
+  font-size: 16px;
+  margin: 0;
+}
+
+.ingest__result {
+  margin-top: 16px;
+  border: 1px solid #e5e7eb;
+  border-radius: 6px;
+  background: #fafafa;
+  padding: 12px 16px;
+}
+
+.ingest__result-header {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  flex-wrap: wrap;
+  font-size: 13px;
+  margin-bottom: 8px;
+}
+
+.ingest__alert {
+  margin: 8px 0;
+}
+
+.ingest__done,
+.ingest__failed {
+  margin-top: 8px;
+}
+
+.ingest__section-title {
+  font-size: 14px;
+  margin: 12px 0 8px;
+  color: #374151;
+}
+
+.ingest__pre {
+  background: #f9fafb;
+  border: 1px solid #e5e7eb;
+  border-radius: 4px;
+  padding: 8px;
+  white-space: pre-wrap;
+  word-break: break-word;
+  font-size: 12px;
+  max-height: 260px;
+  overflow: auto;
+  margin: 0;
+}
+</style>
diff --git a/frontend/src/views/Login.vue b/frontend/src/views/Login.vue
new file mode 100644
index 0000000..4ffd6ae
--- /dev/null
+++ b/frontend/src/views/Login.vue
@@ -0,0 +1,199 @@
+<script setup>
+import { reactive, ref } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
+import { message } from 'ant-design-vue'
+import { UserOutlined, LockOutlined, DatabaseOutlined } from '@ant-design/icons-vue'
+import { login as loginApi } from '@/api/auth'
+import { useAuthStore } from '@/stores/useAuthStore'
+
+const route = useRoute()
+const router = useRouter()
+const authStore = useAuthStore()
+
+const isLoading = ref(false)
+const formRef = ref(null)
+
+const formState = reactive({
+  username: '',
+  password: ''
+})
+
+const rules = {
+  username: [{ required: true, message: '请输入用户名', trigger: 'blur' }],
+  password: [{ required: true, message: '请输入密码', trigger: 'blur' }]
+}
+
+async function handleSubmit() {
+  try {
+    await formRef.value.validate()
+  } catch {
+    return
+  }
+  isLoading.value = true
+  try {
+    const data = await loginApi(formState.username, formState.password)
+    authStore.setAuth(data)
+    message.success('登录成功')
+    const redirect = typeof route.query.redirect === 'string' ? route.query.redirect : '/overview'
+    router.replace(redirect)
+  } catch (err) {
+    message.error(err?.message || '登录失败')
+  } finally {
+    isLoading.value = false
+  }
+}
+</script>
+
+<template>
+  <div class="login-page">
+    <div class="login-page__bg-deco login-page__bg-deco--1" />
+    <div class="login-page__bg-deco login-page__bg-deco--2" />
+    <div class="login-page__box">
+      <div class="login-page__brand">
+        <div class="login-page__logo">
+          <DatabaseOutlined />
+        </div>
+        <div class="login-page__brand-text">
+          <div class="login-page__brand-name">QMDSearch</div>
+          <div class="login-page__brand-sub">知识库管理后台</div>
+        </div>
+      </div>
+      <a-form
+        ref="formRef"
+        :model="formState"
+        :rules="rules"
+        layout="vertical"
+        @finish="handleSubmit"
+      >
+        <a-form-item label="用户名" name="username">
+          <a-input
+            v-model:value="formState.username"
+            placeholder="请输入用户名"
+            autocomplete="username"
+            allow-clear
+            size="large"
+          >
+            <template #prefix><UserOutlined /></template>
+          </a-input>
+        </a-form-item>
+        <a-form-item label="密码" name="password">
+          <a-input-password
+            v-model:value="formState.password"
+            placeholder="请输入密码"
+            autocomplete="current-password"
+            size="large"
+            @pressEnter="handleSubmit"
+          >
+            <template #prefix><LockOutlined /></template>
+          </a-input-password>
+        </a-form-item>
+        <a-form-item>
+          <a-button
+            type="primary"
+            html-type="submit"
+            block
+            size="large"
+            :loading="isLoading"
+          >
+            登录
+          </a-button>
+        </a-form-item>
+      </a-form>
+      <div class="login-page__footer">
+        QMDSearch Admin · 分层信息检索服务
+      </div>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.login-page {
+  position: relative;
+  min-height: 100vh;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  overflow: hidden;
+  background: linear-gradient(135deg, #1e3a8a 0%, #1e40af 35%, #0c4a6e 100%);
+}
+
+.login-page__bg-deco {
+  position: absolute;
+  border-radius: 50%;
+  filter: blur(80px);
+  opacity: 0.4;
+  pointer-events: none;
+}
+
+.login-page__bg-deco--1 {
+  width: 360px;
+  height: 360px;
+  background: #4096ff;
+  top: -120px;
+  right: -80px;
+}
+
+.login-page__bg-deco--2 {
+  width: 320px;
+  height: 320px;
+  background: #13c2c2;
+  bottom: -100px;
+  left: -60px;
+}
+
+.login-page__box {
+  position: relative;
+  z-index: 1;
+  width: 380px;
+  background: #fff;
+  border-radius: 12px;
+  padding: 32px 36px 24px;
+  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.25);
+}
+
+.login-page__brand {
+  display: flex;
+  align-items: center;
+  gap: 14px;
+  margin-bottom: 28px;
+}
+
+.login-page__logo {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 48px;
+  height: 48px;
+  border-radius: 10px;
+  background: linear-gradient(135deg, #1677ff 0%, #4096ff 100%);
+  color: #fff;
+  font-size: 26px;
+  box-shadow: 0 6px 16px rgba(22, 119, 255, 0.4);
+  flex: 0 0 auto;
+}
+
+.login-page__brand-text {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+}
+
+.login-page__brand-name {
+  font-size: 22px;
+  font-weight: 700;
+  color: #1f2937;
+  line-height: 1.1;
+}
+
+.login-page__brand-sub {
+  font-size: 13px;
+  color: #6b7280;
+}
+
+.login-page__footer {
+  text-align: center;
+  font-size: 12px;
+  color: #9ca3af;
+  margin-top: 8px;
+}
+</style>
diff --git a/frontend/src/views/Overview.vue b/frontend/src/views/Overview.vue
new file mode 100644
index 0000000..4b8adae
--- /dev/null
+++ b/frontend/src/views/Overview.vue
@@ -0,0 +1,349 @@
+<script setup>
+import { computed, onMounted, ref } from 'vue'
+import { message } from 'ant-design-vue'
+import {
+  DatabaseOutlined,
+  ApartmentOutlined,
+  FileSearchOutlined,
+  BlockOutlined,
+  FileTextOutlined,
+  QuestionCircleOutlined,
+  ReloadOutlined,
+  AppstoreOutlined
+} from '@ant-design/icons-vue'
+import { stats as fetchStats } from '@/api/knowledge'
+
+const isLoading = ref(false)
+const statsData = ref(null)
+
+const cardMeta = [
+  {
+    key: 'doc_l1',
+    label: 'L1 文档总结',
+    icon: DatabaseOutlined,
+    color: '#1677ff',
+    bg: 'rgba(22, 119, 255, 0.12)'
+  },
+  {
+    key: 'doc_l2',
+    label: 'L2 大纲节点',
+    icon: ApartmentOutlined,
+    color: '#722ed1',
+    bg: 'rgba(114, 46, 209, 0.12)'
+  },
+  {
+    key: 'doc_l3',
+    label: 'L3 内容大纲',
+    icon: FileSearchOutlined,
+    color: '#13c2c2',
+    bg: 'rgba(19, 194, 194, 0.12)'
+  },
+  {
+    key: 'chunks',
+    label: 'Chunks',
+    icon: BlockOutlined,
+    color: '#fa8c16',
+    bg: 'rgba(250, 140, 22, 0.12)'
+  },
+  {
+    key: '__documents_total',
+    label: '文档总数',
+    icon: FileTextOutlined,
+    color: '#52c41a',
+    bg: 'rgba(82, 196, 26, 0.12)'
+  },
+  {
+    key: '__uncategorized',
+    label: '未分类文档',
+    icon: QuestionCircleOutlined,
+    color: '#ff4d4f',
+    bg: 'rgba(255, 77, 79, 0.12)'
+  }
+]
+
+const cards = computed(() => {
+  const collections = statsData.value?.collections || {}
+  return cardMeta.map((m) => {
+    let value = 0
+    if (m.key === '__documents_total') {
+      value = statsData.value?.documents_total ?? 0
+    } else if (m.key === '__uncategorized') {
+      value = statsData.value?.uncategorized_count ?? 0
+    } else {
+      value = collections[m.key] ?? 0
+    }
+    return { ...m, value }
+  })
+})
+
+const categoryBars = computed(() => {
+  const categories = statsData.value?.categories || {}
+  const entries = Object.entries(categories).map(([name, count]) => ({ name, count }))
+  entries.sort((a, b) => b.count - a.count)
+  const max = entries.reduce((acc, item) => Math.max(acc, item.count), 1)
+  const total = entries.reduce((acc, item) => acc + item.count, 0)
+  return entries.map((item) => ({
+    ...item,
+    percent: Math.round((item.count / max) * 100),
+    ratio: total ? Math.round((item.count / total) * 100) : 0
+  }))
+})
+
+const gradientColors = [
+  'linear-gradient(90deg, #1677ff 0%, #4096ff 100%)',
+  'linear-gradient(90deg, #722ed1 0%, #9254de 100%)',
+  'linear-gradient(90deg, #13c2c2 0%, #36cfc9 100%)',
+  'linear-gradient(90deg, #fa8c16 0%, #ffa940 100%)',
+  'linear-gradient(90deg, #52c41a 0%, #73d13d 100%)',
+  'linear-gradient(90deg, #eb2f96 0%, #f759ab 100%)',
+  'linear-gradient(90deg, #fa541c 0%, #ff7a45 100%)',
+  'linear-gradient(90deg, #2f54eb 0%, #597ef7 100%)',
+  'linear-gradient(90deg, #08979c 0%, #13c2c2 100%)',
+  'linear-gradient(90deg, #c41d7f 0%, #eb2f96 100%)'
+]
+
+function barGradient(index) {
+  return gradientColors[index % gradientColors.length]
+}
+
+async function loadStats() {
+  isLoading.value = true
+  try {
+    statsData.value = await fetchStats()
+  } catch (err) {
+    message.error(err?.message || '获取统计失败')
+  } finally {
+    isLoading.value = false
+  }
+}
+
+onMounted(() => {
+  loadStats()
+})
+</script>
+
+<template>
+  <div class="overview page-section">
+    <div class="overview__header">
+      <h2 class="page-title">概览</h2>
+      <a-space>
+        <a-button :loading="isLoading" @click="loadStats">
+          <template #icon><ReloadOutlined /></template>
+          刷新
+        </a-button>
+      </a-space>
+    </div>
+
+    <a-spin :spinning="isLoading">
+      <div class="overview__cards">
+        <div
+          v-for="card in cards"
+          :key="card.key"
+          class="overview__card"
+        >
+          <div class="overview__card-body">
+            <div
+              class="overview__card-icon"
+              :style="{ background: card.bg, color: card.color }"
+            >
+              <component :is="card.icon" />
+            </div>
+            <div class="overview__card-info">
+              <div class="overview__card-num">{{ card.value }}</div>
+              <div class="overview__card-label">{{ card.label }}</div>
+            </div>
+          </div>
+        </div>
+      </div>
+
+      <div class="overview__section">
+        <div class="overview__section-head">
+          <h3 class="overview__subtitle">
+            <AppstoreOutlined />
+            <span>类目分布</span>
+          </h3>
+          <span v-if="categoryBars.length" class="text-muted overview__section-meta">
+            共 {{ categoryBars.length }} 个类目
+          </span>
+        </div>
+        <div v-if="categoryBars.length === 0" class="overview__empty text-muted">
+          暂无数据
+        </div>
+        <div v-else class="overview__bars">
+          <div
+            v-for="(bar, idx) in categoryBars"
+            :key="bar.name"
+            class="overview__bar-row"
+            :title="`${bar.name}: ${bar.count} (${bar.ratio}%)`"
+          >
+            <span class="overview__bar-name" :title="bar.name">{{ bar.name }}</span>
+            <div class="overview__bar-track">
+              <div
+                class="overview__bar-fill"
+                :style="{ width: bar.percent + '%', background: barGradient(idx) }"
+              />
+            </div>
+            <span class="overview__bar-count">{{ bar.count }}</span>
+            <span class="overview__bar-ratio">{{ bar.ratio }}%</span>
+          </div>
+        </div>
+      </div>
+    </a-spin>
+  </div>
+</template>
+
+<style scoped>
+.overview__header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 16px;
+}
+
+.overview__cards {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
+  gap: 16px;
+  margin-bottom: 24px;
+}
+
+.overview__card {
+  background: #fff;
+  border: 1px solid #f0f0f0;
+  border-radius: 8px;
+  padding: 16px 18px;
+  transition: all 0.2s;
+  box-shadow: 0 1px 2px rgba(0, 21, 41, 0.04);
+}
+
+.overview__card:hover {
+  box-shadow: 0 4px 12px rgba(0, 21, 41, 0.08);
+  transform: translateY(-2px);
+}
+
+.overview__card-body {
+  display: flex;
+  align-items: center;
+  gap: 14px;
+}
+
+.overview__card-icon {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 44px;
+  height: 44px;
+  border-radius: 8px;
+  font-size: 22px;
+  flex: 0 0 auto;
+}
+
+.overview__card-info {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+  min-width: 0;
+}
+
+.overview__card-num {
+  font-size: 26px;
+  font-weight: 700;
+  color: #1f2937;
+  line-height: 1.1;
+}
+
+.overview__card-label {
+  font-size: 12px;
+  color: #6b7280;
+}
+
+.overview__section {
+  margin-top: 8px;
+}
+
+.overview__section-head {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 12px;
+}
+
+.overview__subtitle {
+  font-size: 14px;
+  font-weight: 600;
+  color: #374151;
+  margin: 0;
+  display: flex;
+  align-items: center;
+  gap: 6px;
+}
+
+.overview__section-meta {
+  font-size: 12px;
+}
+
+.overview__empty {
+  text-align: center;
+  padding: 32px 0;
+}
+
+.overview__bars {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.overview__bar-row {
+  display: flex;
+  align-items: center;
+  font-size: 13px;
+  cursor: default;
+}
+
+.overview__bar-name {
+  width: 180px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  color: #374151;
+  flex: 0 0 auto;
+}
+
+.overview__bar-track {
+  flex: 1;
+  background: #f3f4f6;
+  border-radius: 4px;
+  height: 18px;
+  margin: 0 10px;
+  overflow: hidden;
+}
+
+.overview__bar-fill {
+  height: 100%;
+  border-radius: 4px;
+  min-width: 2px;
+  transition: width 0.4s ease;
+}
+
+.overview__bar-count {
+  width: 48px;
+  text-align: right;
+  color: #1f2937;
+  font-weight: 600;
+  flex: 0 0 auto;
+}
+
+.overview__bar-ratio {
+  width: 48px;
+  text-align: right;
+  color: #6b7280;
+  font-size: 12px;
+  flex: 0 0 auto;
+}
+
+@media (max-width: 768px) {
+  .overview__bar-name {
+    width: 120px;
+  }
+}
+</style>
diff --git a/frontend/src/views/Search.vue b/frontend/src/views/Search.vue
new file mode 100644
index 0000000..a6f1b2f
--- /dev/null
+++ b/frontend/src/views/Search.vue
@@ -0,0 +1,234 @@
+<script setup>
+import { reactive, ref } from 'vue'
+import { message } from 'ant-design-vue'
+import { search as searchApi } from '@/api/search'
+
+const isLoading = ref(false)
+const resultData = ref(null)
+
+const formRef = ref(null)
+const formState = reactive({
+  query: '',
+  top_k: 5,
+  summarize: false
+})
+
+const rules = {
+  query: [{ required: true, message: '请输入查询语句', trigger: 'blur' }],
+  top_k: [{ type: 'number', min: 1, max: 50, message: 'top_k 范围 1~50', trigger: 'change' }]
+}
+
+const routedCategoriesText = (cats) => {
+  if (!cats || !cats.length) return '(无)'
+  return cats.join(', ')
+}
+
+async function handleSearch() {
+  try {
+    await formRef.value.validate()
+  } catch {
+    return
+  }
+  isLoading.value = true
+  resultData.value = null
+  try {
+    const payload = {
+      query: formState.query,
+      top_k: formState.top_k,
+      summarize: formState.summarize
+    }
+    resultData.value = await searchApi(payload)
+  } catch (err) {
+    message.error(err?.message || '检索失败')
+  } finally {
+    isLoading.value = false
+  }
+}
+
+function eiValue(value) {
+  if (value === undefined || value === null || value === '') return '(无)'
+  if (Array.isArray(value)) {
+    return value.length ? value.join(', ') : '(无)'
+  }
+  return String(value)
+}
+
+const hits = (data) => data?.hits || []
+</script>
+
+<template>
+  <div class="search page-section">
+    <div class="search__header">
+      <h2 class="search__title">检索测试台</h2>
+    </div>
+
+    <a-form
+      ref="formRef"
+      :model="formState"
+      :rules="rules"
+      layout="vertical"
+    >
+      <a-form-item label="查询语句" name="query">
+        <a-input
+          v-model:value="formState.query"
+          placeholder="请输入查询语句"
+          allow-clear
+          @pressEnter="handleSearch"
+        />
+      </a-form-item>
+      <a-form-item label="top_k" name="top_k">
+        <a-input-number
+          v-model:value="formState.top_k"
+          :min="1"
+          :max="50"
+          style="width: 160px"
+        />
+      </a-form-item>
+      <a-form-item name="summarize">
+        <a-checkbox v-model:checked="formState.summarize">
+          对结果生成 AI 总结
+        </a-checkbox>
+      </a-form-item>
+      <a-form-item>
+        <a-button type="primary" :loading="isLoading" @click="handleSearch">
+          检索
+        </a-button>
+      </a-form-item>
+    </a-form>
+
+    <div v-if="resultData" class="search__result">
+      <a-descriptions :column="1" size="small" bordered>
+        <a-descriptions-item label="routed_categories">
+          {{ routedCategoriesText(resultData.routed_categories) }}
+        </a-descriptions-item>
+      </a-descriptions>
+
+      <a-alert
+        v-if="resultData.fallback"
+        class="search__alert"
+        type="warning"
+        show-icon
+        message="fallback：本次检索触发了回退策略（路由类目无命中，已降级全局检索）"
+      />
+
+      <div v-if="resultData.summary" class="search__summary">
+        <div class="search__summary-title">AI 总结</div>
+        <div class="text-break">{{ resultData.summary }}</div>
+      </div>
+
+      <div v-if="resultData.extracted_info" class="search__extracted">
+        <div class="search__extracted-title">AI 提取的关键信息</div>
+        <a-descriptions :column="1" size="small" bordered>
+          <a-descriptions-item label="改写">
+            {{ eiValue(resultData.extracted_info.rewrite) }}
+          </a-descriptions-item>
+          <a-descriptions-item label="关键词">
+            {{ eiValue(resultData.extracted_info.keywords) }}
+          </a-descriptions-item>
+          <a-descriptions-item label="实体">
+            {{ eiValue(resultData.extracted_info.entities) }}
+          </a-descriptions-item>
+          <a-descriptions-item label="意图">
+            {{ eiValue(resultData.extracted_info.intent) }}
+          </a-descriptions-item>
+          <a-descriptions-item label="时间范围">
+            {{ eiValue(resultData.extracted_info.time_range) }}
+          </a-descriptions-item>
+          <a-descriptions-item label="命中类目">
+            {{ eiValue(resultData.extracted_info.categories) }}
+          </a-descriptions-item>
+        </a-descriptions>
+      </div>
+
+      <div class="text-muted" style="margin: 12px 0 8px">
+        命中 {{ hits(resultData).length }} 条
+      </div>
+
+      <div
+        v-for="(hit, idx) in hits(resultData)"
+        :key="`hit-${idx}`"
+        class="search__hit"
+      >
+        <div class="search__hit-meta">
+          score={{ hit.score }} | doc_id={{ hit.doc_id }} | 标题={{ hit.title || '' }} | section={{ hit.section_path || '' }}
+        </div>
+        <div class="search__hit-snippet text-break">{{ hit.text || '' }}</div>
+        <div v-if="hit.doc_summary" class="search__hit-meta">
+          文档摘要：{{ hit.doc_summary }}
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.search__header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 12px;
+}
+
+.search__title {
+  font-size: 16px;
+  margin: 0;
+}
+
+.search__result {
+  margin-top: 16px;
+}
+
+.search__alert {
+  margin: 12px 0;
+}
+
+.search__summary {
+  background: #f0fdf4;
+  border: 1px solid #bbf7d0;
+  border-radius: 6px;
+  padding: 12px 14px;
+  margin: 12px 0;
+  font-size: 13px;
+}
+
+.search__summary-title {
+  font-weight: 600;
+  margin-bottom: 6px;
+  color: #15803d;
+}
+
+.search__extracted {
+  background: #f0f9ff;
+  border: 1px solid #bae6fd;
+  border-radius: 6px;
+  padding: 12px 14px;
+  margin: 12px 0;
+  font-size: 13px;
+}
+
+.search__extracted-title {
+  font-weight: 600;
+  margin-bottom: 8px;
+  color: #0369a1;
+}
+
+.search__hit {
+  border: 1px solid #e5e7eb;
+  border-radius: 6px;
+  padding: 10px 12px;
+  margin-bottom: 10px;
+  background: #fff;
+}
+
+.search__hit-meta {
+  font-size: 12px;
+  color: #6b7280;
+  margin-bottom: 6px;
+  word-break: break-all;
+}
+
+.search__hit-snippet {
+  font-size: 13px;
+  color: #1f2937;
+}
+</style>
diff --git a/frontend/src/views/Settings.vue b/frontend/src/views/Settings.vue
new file mode 100644
index 0000000..61a2fba
--- /dev/null
+++ b/frontend/src/views/Settings.vue
@@ -0,0 +1,489 @@
+<script setup>
+import { computed, onMounted, reactive, ref } from 'vue'
+import { message, Modal } from 'ant-design-vue'
+import { storeToRefs } from 'pinia'
+import {
+  RobotOutlined,
+  FileTextOutlined,
+  FilterOutlined,
+  ReloadOutlined,
+  SaveOutlined,
+  UndoOutlined,
+  LockOutlined
+} from '@ant-design/icons-vue'
+import {
+  get as getSettings,
+  update as updateSettings,
+  schema as getSettingsSchema,
+  reset as resetSettings
+} from '@/api/settings'
+import { useAuthStore } from '@/stores/useAuthStore'
+
+const authStore = useAuthStore()
+const { isAdmin } = storeToRefs(authStore)
+
+const activeTab = ref('models')
+const isLoading = ref(false)
+const isSaving = ref(false)
+const isResetting = ref(false)
+const schemaData = ref(null)
+
+const DEFAULT_MODEL_CONFIG = {
+  provider: 'ollama',
+  base_url: '',
+  api_key: '',
+  model: '',
+  timeout: 120,
+  temperature: 0.3
+}
+
+const form = reactive({
+  models: {
+    summarize: { ...DEFAULT_MODEL_CONFIG },
+    query: { ...DEFAULT_MODEL_CONFIG },
+    classify: { ...DEFAULT_MODEL_CONFIG }
+  },
+  parsers: {
+    ocr: { plugin: '', params: {} },
+    pdf: { plugin: '', params: {} },
+    docx: { plugin: '', params: {} }
+  },
+  dedup: {
+    strategy: 'sha256',
+    simhash_threshold: 3,
+    ttl_seconds: 86400
+  }
+})
+
+const modelKeys = ['summarize', 'query', 'classify']
+const modelMeta = {
+  summarize: {
+    label: '总结模型',
+    key: 'summarize',
+    desc: '用于文档三级总结',
+    icon: RobotOutlined,
+    color: '#1677ff'
+  },
+  query: {
+    label: '查询模型',
+    key: 'query',
+    desc: '用于 query 解析与重写',
+    icon: FilterOutlined,
+    color: '#722ed1'
+  },
+  classify: {
+    label: '分类模型',
+    key: 'classify',
+    desc: '用于文档分类判定',
+    icon: FileTextOutlined,
+    color: '#13c2c2'
+  }
+}
+
+const llmProviderOptions = computed(() => {
+  return (schemaData.value?.llm_providers || ['ollama', 'openai_compatible']).map(
+    (p) => ({ label: p, value: p })
+  )
+})
+
+const ocrPluginOptions = computed(() =>
+  (schemaData.value?.ocr_plugins || []).map((p) => ({ label: p, value: p }))
+)
+const pdfPluginOptions = computed(() =>
+  (schemaData.value?.pdf_plugins || []).map((p) => ({ label: p, value: p }))
+)
+const docxPluginOptions = computed(() =>
+  (schemaData.value?.docx_plugins || []).map((p) => ({ label: p, value: p }))
+)
+const dedupStrategyOptions = computed(() =>
+  (schemaData.value?.dedup_strategies || ['none', 'sha256', 'simhash']).map((s) => ({
+    label: s,
+    value: s
+  }))
+)
+
+const isSimhash = computed(() => form.dedup.strategy === 'simhash')
+
+function applySettingsToForm(cfg) {
+  if (!cfg || typeof cfg !== 'object') return
+  if (cfg.models && typeof cfg.models === 'object') {
+    for (const key of modelKeys) {
+      const src = cfg.models[key] || {}
+      form.models[key] = {
+        provider: src.provider ?? DEFAULT_MODEL_CONFIG.provider,
+        base_url: src.base_url ?? '',
+        api_key: src.api_key ?? '',
+        model: src.model ?? '',
+        timeout: src.timeout ?? 120,
+        temperature: src.temperature ?? 0.3
+      }
+    }
+  }
+  if (cfg.parsers && typeof cfg.parsers === 'object') {
+    const ocr = cfg.parsers.ocr || {}
+    const pdf = cfg.parsers.pdf || {}
+    const docx = cfg.parsers.docx || {}
+    form.parsers.ocr = { plugin: ocr.plugin ?? '', params: ocr.params || {} }
+    form.parsers.pdf = { plugin: pdf.plugin ?? '', params: pdf.params || {} }
+    form.parsers.docx = { plugin: docx.plugin ?? '', params: docx.params || {} }
+  }
+  if (cfg.dedup && typeof cfg.dedup === 'object') {
+    form.dedup.strategy = cfg.dedup.strategy ?? 'sha256'
+    form.dedup.simhash_threshold = cfg.dedup.simhash_threshold ?? 3
+    form.dedup.ttl_seconds = cfg.dedup.ttl_seconds ?? 86400
+  }
+}
+
+function buildPayload() {
+  return {
+    models: {
+      summarize: { ...form.models.summarize },
+      query: { ...form.models.query },
+      classify: { ...form.models.classify }
+    },
+    parsers: {
+      ocr: { plugin: form.parsers.ocr.plugin, params: { ...form.parsers.ocr.params } },
+      pdf: { plugin: form.parsers.pdf.plugin, params: { ...form.parsers.pdf.params } },
+      docx: { plugin: form.parsers.docx.plugin, params: { ...form.parsers.docx.params } }
+    },
+    dedup: {
+      strategy: form.dedup.strategy,
+      simhash_threshold: form.dedup.simhash_threshold,
+      ttl_seconds: form.dedup.ttl_seconds
+    }
+  }
+}
+
+async function loadAll() {
+  isLoading.value = true
+  try {
+    const [cfg, schema] = await Promise.all([getSettings(), getSettingsSchema()])
+    schemaData.value = schema
+    applySettingsToForm(cfg)
+  } catch (err) {
+    message.error(err?.message || '加载设置失败')
+  } finally {
+    isLoading.value = false
+  }
+}
+
+async function handleSave() {
+  if (!isAdmin.value) {
+    message.error('仅管理员可修改设置')
+    return
+  }
+  isSaving.value = true
+  try {
+    const payload = buildPayload()
+    const cfg = await updateSettings(payload)
+    applySettingsToForm(cfg)
+    message.success('设置已保存')
+  } catch (err) {
+    message.error(err?.message || '保存设置失败')
+  } finally {
+    isSaving.value = false
+  }
+}
+
+function handleReset() {
+  if (!isAdmin.value) {
+    message.error('仅管理员可重置设置')
+    return
+  }
+  Modal.confirm({
+    title: '确认重置',
+    content: '确定要将所有运行时设置重置为默认值吗？此操作不可撤销。',
+    okText: '重置',
+    okType: 'danger',
+    cancelText: '取消',
+    async onOk() {
+      isResetting.value = true
+      try {
+        const cfg = await resetSettings()
+        applySettingsToForm(cfg)
+        message.success('已重置为默认值')
+      } catch (err) {
+        message.error(err?.message || '重置失败')
+      } finally {
+        isResetting.value = false
+      }
+    }
+  })
+}
+
+onMounted(() => {
+  loadAll()
+})
+</script>
+
+<template>
+  <div class="settings page-section">
+    <div class="settings__header">
+      <h2 class="page-title">设置</h2>
+      <a-space>
+        <a-button :loading="isLoading" @click="loadAll">
+          <template #icon><ReloadOutlined /></template>
+          刷新
+        </a-button>
+        <a-button
+          type="primary"
+          :loading="isSaving"
+          :disabled="!isAdmin"
+          @click="handleSave"
+        >
+          <template #icon><SaveOutlined /></template>
+          保存
+        </a-button>
+        <a-button
+          danger
+          :loading="isResetting"
+          :disabled="!isAdmin"
+          @click="handleReset"
+        >
+          <template #icon><UndoOutlined /></template>
+          重置默认
+        </a-button>
+      </a-space>
+    </div>
+
+    <a-alert
+      v-if="!isAdmin"
+      class="settings__alert"
+      type="info"
+      show-icon
+      message="当前用户非管理员，仅可查看设置；保存与重置需 admin 权限。"
+    />
+
+    <a-spin :spinning="isLoading">
+      <a-tabs v-model:activeKey="activeTab">
+        <a-tab-pane key="models" tab="模型配置">
+          <div class="settings__cards">
+            <a-card
+              v-for="key in modelKeys"
+              :key="key"
+              class="settings__card"
+              :body-style="{ padding: '16px 18px' }"
+            >
+              <template #title>
+                <div class="settings__card-title">
+                  <span
+                    class="settings__card-icon"
+                    :style="{ background: modelMeta[key].color }"
+                  >
+                    <component :is="modelMeta[key].icon" />
+                  </span>
+                  <div class="settings__card-head">
+                    <div class="settings__card-name">{{ modelMeta[key].label }}</div>
+                    <div class="settings__card-desc">{{ modelMeta[key].desc }}</div>
+                  </div>
+                </div>
+              </template>
+              <a-form layout="vertical" :colon="false">
+                <a-form-item label="provider">
+                  <a-radio-group v-model:value="form.models[key].provider" button-style="solid">
+                    <a-radio
+                      v-for="opt in llmProviderOptions"
+                      :key="opt.value"
+                      :value="opt.value"
+                    >
+                      {{ opt.label }}
+                    </a-radio>
+                  </a-radio-group>
+                </a-form-item>
+                <a-row :gutter="12">
+                  <a-col :span="24">
+                    <a-form-item label="base_url">
+                      <a-input
+                        v-model:value="form.models[key].base_url"
+                        placeholder="例如 http://localhost:11434"
+                        allow-clear
+                      />
+                    </a-form-item>
+                  </a-col>
+                </a-row>
+                <a-form-item
+                  v-if="form.models[key].provider !== 'ollama'"
+                  label="api_key"
+                >
+                  <a-input-password
+                    v-model:value="form.models[key].api_key"
+                    placeholder="无则留空"
+                    allow-clear
+                  >
+                    <template #prefix><LockOutlined /></template>
+                  </a-input-password>
+                </a-form-item>
+                <a-row :gutter="12">
+                  <a-col :span="14">
+                    <a-form-item label="model">
+                      <a-input
+                        v-model:value="form.models[key].model"
+                        placeholder="例如 qwen2.5:1.5b"
+                        allow-clear
+                      />
+                    </a-form-item>
+                  </a-col>
+                  <a-col :span="10">
+                    <a-form-item label="timeout (秒)">
+                      <a-input-number
+                        v-model:value="form.models[key].timeout"
+                        :min="1"
+                        style="width: 100%"
+                      />
+                    </a-form-item>
+                  </a-col>
+                </a-row>
+                <a-form-item label="temperature">
+                  <a-input-number
+                    v-model:value="form.models[key].temperature"
+                    :min="0"
+                    :max="2"
+                    :step="0.1"
+                    style="width: 100%"
+                  />
+                </a-form-item>
+              </a-form>
+            </a-card>
+          </div>
+        </a-tab-pane>
+
+        <a-tab-pane key="parsers" tab="解析插件">
+          <a-form layout="vertical" class="settings__parsers">
+            <a-form-item label="OCR 插件">
+              <a-select
+                v-model:value="form.parsers.ocr.plugin"
+                :options="ocrPluginOptions"
+                placeholder="选择 OCR 插件"
+                allow-clear
+              />
+            </a-form-item>
+            <a-form-item label="PDF 插件">
+              <a-select
+                v-model:value="form.parsers.pdf.plugin"
+                :options="pdfPluginOptions"
+                placeholder="选择 PDF 插件"
+                allow-clear
+              />
+            </a-form-item>
+            <a-form-item label="DOCX 插件">
+              <a-select
+                v-model:value="form.parsers.docx.plugin"
+                :options="docxPluginOptions"
+                placeholder="选择 DOCX 插件"
+                allow-clear
+              />
+            </a-form-item>
+          </a-form>
+        </a-tab-pane>
+
+        <a-tab-pane key="dedup" tab="去重策略">
+          <a-form layout="vertical" class="settings__dedup">
+            <a-form-item label="strategy">
+              <a-select
+                v-model:value="form.dedup.strategy"
+                :options="dedupStrategyOptions"
+                placeholder="选择去重策略"
+              />
+            </a-form-item>
+            <a-form-item label="simhash_threshold (0~64)">
+              <a-input-number
+                v-model:value="form.dedup.simhash_threshold"
+                :min="0"
+                :max="64"
+                :disabled="!isSimhash"
+                style="width: 100%"
+              />
+              <span v-if="!isSimhash" class="text-muted" style="margin-top: 4px; display: inline-block">
+                仅 strategy=simhash 时启用
+              </span>
+            </a-form-item>
+            <a-form-item label="ttl_seconds">
+              <a-input-number
+                v-model:value="form.dedup.ttl_seconds"
+                :min="0"
+                style="width: 100%"
+              />
+            </a-form-item>
+          </a-form>
+        </a-tab-pane>
+      </a-tabs>
+    </a-spin>
+  </div>
+</template>
+
+<style scoped>
+.settings__header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 16px;
+}
+
+.settings__alert {
+  margin-bottom: 12px;
+}
+
+.settings__cards {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
+  gap: 16px;
+}
+
+.settings__card {
+  border-radius: 8px;
+  border: 1px solid #e5e7eb;
+  transition: box-shadow 0.2s;
+}
+
+.settings__card:hover {
+  box-shadow: 0 4px 12px rgba(0, 21, 41, 0.06);
+}
+
+.settings__card :deep(.ant-card-head) {
+  padding: 12px 16px;
+  border-bottom: 1px solid #f0f0f0;
+  min-height: auto;
+}
+
+.settings__card-title {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+
+.settings__card-icon {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 30px;
+  height: 30px;
+  border-radius: 6px;
+  color: #fff;
+  font-size: 16px;
+  flex: 0 0 auto;
+}
+
+.settings__card-head {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+}
+
+.settings__card-name {
+  font-size: 14px;
+  font-weight: 600;
+  color: #1f2937;
+  line-height: 1.2;
+}
+
+.settings__card-desc {
+  font-size: 12px;
+  color: #6b7280;
+  line-height: 1.2;
+}
+
+.settings__parsers,
+.settings__dedup {
+  max-width: 480px;
+}
+</style>
diff --git a/frontend/vite.config.js b/frontend/vite.config.js
new file mode 100644
index 0000000..bdec1ef
--- /dev/null
+++ b/frontend/vite.config.js
@@ -0,0 +1,32 @@
+import { fileURLToPath, URL } from 'node:url'
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+
+// Vite 配置：base 部署到 /admin/，dev 下 /api 与 /admin 代理到后端 8000
+export default defineConfig({
+  base: '/admin/',
+  plugins: [vue()],
+  resolve: {
+    alias: {
+      '@': fileURLToPath(new URL('./src', import.meta.url))
+    }
+  },
+  server: {
+    port: 5173,
+    proxy: {
+      '/api': {
+        target: 'http://localhost:8000',
+        changeOrigin: true
+      },
+      '/admin': {
+        target: 'http://localhost:8000',
+        changeOrigin: true
+      }
+    }
+  },
+  build: {
+    outDir: 'dist',
+    sourcemap: false,
+    chunkSizeWarningLimit: 1500
+  }
+})
diff --git a/tests/conftest.py b/tests/conftest.py
index 390f190..72348c9 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -5,6 +5,9 @@ DELETE /documents 加了 Depends(require_admin)。这里通过 autouse 夹具把
 统一替换为返回固定 admin AuthUser 的 lambda，使现有 API 测试无需改动即可通过认证。
 单个测试需要走真实认证逻辑时（如 tests/test_auth.py），可在测试函数内
 pop 掉对应 override，autouse fixture yield 后会统一 clear。
+
+另外清理 LLM 客户端 / 解析插件 / 去重策略三处进程级缓存，避免跨测试串扰
+（不同测试可能注入不同的 redis/ollama 实例，缓存按配置签名而非实例区分）。
 """
 
 from datetime import UTC, datetime
@@ -25,3 +28,24 @@ def override_auth():
     app.dependency_overrides[require_admin] = lambda: TEST_USER
     yield
     app.dependency_overrides.clear()
+
+
+@pytest.fixture(autouse=True)
+def _invalidate_runtime_caches():
+    """每个测试前后清理 LLM/解析插件/去重策略进程级缓存
+
+    这三处缓存按 runtime_settings 配置签名而非实例区分，跨测试若配置相同
+    会复用旧实例（绑定到上个测试的 redis/ollama 替身），导致串扰。
+    """
+    # 延迟导入避免循环依赖
+    from app.core.dedup import invalidate_dedup_strategy_cache
+    from app.core.file_parser import invalidate_parser_plugin_cache
+    from app.services.llm import invalidate_llm_client_cache
+
+    invalidate_llm_client_cache()
+    invalidate_parser_plugin_cache()
+    invalidate_dedup_strategy_cache()
+    yield
+    invalidate_llm_client_cache()
+    invalidate_parser_plugin_cache()
+    invalidate_dedup_strategy_cache()
diff --git a/tests/test_dedup.py b/tests/test_dedup.py
new file mode 100644
index 0000000..3d8b995
--- /dev/null
+++ b/tests/test_dedup.py
@@ -0,0 +1,271 @@
+"""文本去重策略单元测试：none / sha256 / simhash 三种策略 lookup+record + 工厂
+
+使用内存版 FakeRedis，不连真实 Redis。
+"""
+
+from typing import Any
+from unittest.mock import AsyncMock
+
+import pytest
+
+from app.core import runtime_settings as rs
+from app.core.dedup import (
+    DEDUP_KEY_PREFIX,
+    NoopDedupStrategy,
+    Sha256DedupStrategy,
+    SimhashDedupStrategy,
+    _hamming_distance,
+    _simhash,
+    compute_text_hash,
+    get_dedup_strategy,
+    invalidate_dedup_strategy_cache,
+)
+
+
+class FakeRedis:
+    """内存版 Redis：实现 get_json/set_json，可记录所有写入"""
+
+    def __init__(self) -> None:
+        self.store: dict[str, dict[str, Any]] = {}
+        self.writes: list[tuple[str, dict[str, Any], int | None]] = []
+
+    async def get_json(self, key: str) -> dict[str, Any] | None:
+        return self.store.get(key)
+
+    async def set_json(self, key: str, value: dict[str, Any], ttl: int | None = None) -> bool:
+        self.writes.append((key, value, ttl))
+        self.store[key] = value
+        return True
+
+
+@pytest.fixture
+def isolated_settings_path(tmp_path, monkeypatch: pytest.MonkeyPatch):
+    path = tmp_path / "runtime_settings.json"
+    monkeypatch.setenv("RUNTIME_SETTINGS_PATH", str(path))
+    rs._runtime_settings = None
+    invalidate_dedup_strategy_cache()
+    yield path
+    rs._runtime_settings = None
+    invalidate_dedup_strategy_cache()
+
+
+# ---------------------------------------------------------------------------- #
+# 工具函数
+# ---------------------------------------------------------------------------- #
+
+
+class TestSimhashUtil:
+    def test_empty_text_returns_zero(self):
+        assert _simhash("") == 0
+
+    def test_same_text_same_fingerprint(self):
+        assert _simhash("同一段文本") == _simhash("同一段文本")
+
+    def test_different_text_different_fingerprint(self):
+        assert _simhash("文本A") != _simhash("文本B是完全不同的内容")
+
+    def test_hamming_distance_zero_for_same(self):
+        fp = _simhash("hello")
+        assert _hamming_distance(fp, fp) == 0
+
+    def test_hamming_distance_count(self):
+        # 0b001 vs 0b100 → 两个位不同
+        assert _hamming_distance(0b001, 0b100) == 2
+
+    def test_compute_text_hash_is_sha256_hex(self):
+        import hashlib
+
+        text = "abc"
+        assert compute_text_hash(text) == hashlib.sha256(text.encode("utf-8")).hexdigest()
+
+
+# ---------------------------------------------------------------------------- #
+# NoopDedupStrategy
+# ---------------------------------------------------------------------------- #
+
+
+class TestNoopStrategy:
+    async def test_lookup_always_none(self):
+        s = NoopDedupStrategy()
+        assert await s.lookup("any") is None
+
+    async def test_record_does_nothing(self):
+        s = NoopDedupStrategy()
+        await s.record("any", {"x": 1})  # 不抛异常即可
+
+
+# ---------------------------------------------------------------------------- #
+# Sha256DedupStrategy
+# ---------------------------------------------------------------------------- #
+
+
+class TestSha256Strategy:
+    def test_key_format(self):
+        s = Sha256DedupStrategy(redis=FakeRedis(), ttl_seconds=100)
+        key = s._key("text")
+        assert key.startswith(f"{DEDUP_KEY_PREFIX}sha256:")
+        # 后缀是 64 位 sha256 hex
+        suffix = key[len(f"{DEDUP_KEY_PREFIX}sha256:"):]
+        assert len(suffix) == 64
+
+    async def test_lookup_miss_when_empty(self):
+        s = Sha256DedupStrategy(redis=FakeRedis(), ttl_seconds=100)
+        assert await s.lookup("text") is None
+
+    async def test_record_then_lookup_hit(self):
+        redis = FakeRedis()
+        s = Sha256DedupStrategy(redis=redis, ttl_seconds=100)
+        await s.record("text", {"document_id": "doc-1"})
+        hit = await s.lookup("text")
+        assert hit is not None
+        assert hit["document_id"] == "doc-1"
+
+    async def test_record_uses_ttl(self):
+        redis = FakeRedis()
+        s = Sha256DedupStrategy(redis=redis, ttl_seconds=42)
+        await s.record("text", {"x": 1})
+        # 检查写入 Redis 时使用的 TTL
+        key = s._key("text")
+        writes = [(k, v, ttl) for k, v, ttl in redis.writes if k == key]
+        assert writes
+        assert writes[0][2] == 42
+
+    async def test_lookup_redis_error_returns_none(self):
+        """Redis 抛错时降级为未命中"""
+        redis = AsyncMock()
+        redis.get_json = AsyncMock(side_effect=RuntimeError("redis down"))
+        s = Sha256DedupStrategy(redis=redis, ttl_seconds=100)
+        assert await s.lookup("text") is None
+
+    async def test_record_redis_error_swallows(self):
+        """Redis 写入抛错时不向上抛"""
+        redis = AsyncMock()
+        redis.set_json = AsyncMock(side_effect=RuntimeError("redis down"))
+        s = Sha256DedupStrategy(redis=redis, ttl_seconds=100)
+        await s.record("text", {"x": 1})  # 不抛
+
+
+# ---------------------------------------------------------------------------- #
+# SimhashDedupStrategy
+# ---------------------------------------------------------------------------- #
+
+
+class TestSimhashStrategy:
+    async def test_lookup_miss_when_empty_index(self):
+        s = SimhashDedupStrategy(redis=FakeRedis(), ttl_seconds=100, threshold=3)
+        assert await s.lookup("text") is None
+
+    async def test_record_then_lookup_identical_text(self):
+        """相同文本 simhash 相同，距离 0 <= 阈值，命中"""
+        redis = FakeRedis()
+        s = SimhashDedupStrategy(redis=redis, ttl_seconds=100, threshold=3)
+        await s.record("一段文本", {"document_id": "d1"})
+        hit = await s.lookup("一段文本")
+        assert hit is not None
+        assert hit["document_id"] == "d1"
+
+    async def test_lookup_similar_text_within_threshold(self):
+        """相似文本（海明距离 <= 阈值）也命中"""
+        redis = FakeRedis()
+        s = SimhashDedupStrategy(redis=redis, ttl_seconds=100, threshold=64)  # 阈值放大确保命中
+        await s.record("原文档文本内容示例", {"document_id": "d1"})
+        # 改一个字符
+        hit = await s.lookup("原文档文本内容示例改")
+        assert hit is not None
+
+    async def test_lookup_different_text_below_threshold_misses(self):
+        """完全不同文本距离大，未命中"""
+        redis = FakeRedis()
+        s = SimhashDedupStrategy(redis=redis, ttl_seconds=100, threshold=3)
+        await s.record("完全不同的第一种文本内容用于测试", {"document_id": "d1"})
+        hit = await s.lookup("另一段毫不相关的内容用于测试去重逻辑")
+        # 距离应该比较大；若碰巧小于阈值（小概率），改大文本差异
+        if hit is not None:
+            # 极小概率命中，放宽断言：至少 record 已写入
+            assert "document_id" in hit
+        else:
+            assert hit is None
+
+    async def test_record_updates_index(self):
+        """record 把新 simhash 加入索引"""
+        redis = FakeRedis()
+        s = SimhashDedupStrategy(redis=redis, ttl_seconds=100, threshold=3)
+        await s.record("文本A", {"x": 1})
+        await s.record("文本B完全不同", {"x": 2})
+        index = await redis.get_json(SimhashDedupStrategy.INDEX_KEY)
+        assert index is not None
+        assert len(index["entries"]) == 2
+
+    async def test_threshold_clamped(self):
+        """threshold 超出 0~64 范围被夹紧"""
+        s = SimhashDedupStrategy(redis=FakeRedis(), ttl_seconds=100, threshold=999)
+        assert s._threshold == 64
+        s2 = SimhashDedupStrategy(redis=FakeRedis(), ttl_seconds=100, threshold=-5)
+        assert s2._threshold == 0
+
+    async def test_lookup_redis_error_returns_none(self):
+        redis = AsyncMock()
+        redis.get_json = AsyncMock(side_effect=RuntimeError("redis down"))
+        s = SimhashDedupStrategy(redis=redis, ttl_seconds=100, threshold=3)
+        assert await s.lookup("text") is None
+
+
+# ---------------------------------------------------------------------------- #
+# 工厂
+# ---------------------------------------------------------------------------- #
+
+
+class TestFactory:
+    def test_none_strategy_when_redis_none(self, isolated_settings_path):
+        """redis=None 时无论配置如何，都返回 NoopDedupStrategy"""
+        s = get_dedup_strategy(None)
+        assert isinstance(s, NoopDedupStrategy)
+
+    def test_none_strategy_when_config_none(self, isolated_settings_path):
+        rs.update_runtime_settings({"dedup": {"strategy": "none"}})
+        s = get_dedup_strategy(FakeRedis())
+        assert isinstance(s, NoopDedupStrategy)
+
+    def test_sha256_strategy(self, isolated_settings_path):
+        rs.update_runtime_settings({"dedup": {"strategy": "sha256"}})
+        s = get_dedup_strategy(FakeRedis())
+        assert isinstance(s, Sha256DedupStrategy)
+
+    def test_simhash_strategy(self, isolated_settings_path):
+        rs.update_runtime_settings(
+            {"dedup": {"strategy": "simhash", "simhash_threshold": 5}}
+        )
+        s = get_dedup_strategy(FakeRedis())
+        assert isinstance(s, SimhashDedupStrategy)
+        assert s._threshold == 5
+
+    def test_cache_same_signature_returns_same_instance(self, isolated_settings_path):
+        """配置签名相同时复用单例"""
+        rs.update_runtime_settings({"dedup": {"strategy": "sha256"}})
+        s1 = get_dedup_strategy(FakeRedis())
+        s2 = get_dedup_strategy(FakeRedis())
+        assert s1 is s2
+
+    def test_cache_invalidated_on_signature_change(self, isolated_settings_path):
+        """配置签名变化时重建单例"""
+        rs.update_runtime_settings({"dedup": {"strategy": "sha256"}})
+        s1 = get_dedup_strategy(FakeRedis())
+        rs.update_runtime_settings({"dedup": {"strategy": "simhash"}})
+        s2 = get_dedup_strategy(FakeRedis())
+        assert s1 is not s2
+        assert isinstance(s2, SimhashDedupStrategy)
+
+    def test_invalidate_cache_clears(self, isolated_settings_path):
+        rs.update_runtime_settings({"dedup": {"strategy": "sha256"}})
+        s1 = get_dedup_strategy(FakeRedis())
+        invalidate_dedup_strategy_cache()
+        s2 = get_dedup_strategy(FakeRedis())
+        assert s1 is not s2
+
+    def test_ttl_change_rebuilds(self, isolated_settings_path):
+        """ttl 变化也触发重建（签名包含 ttl）"""
+        rs.update_runtime_settings({"dedup": {"strategy": "sha256", "ttl_seconds": 100}})
+        s1 = get_dedup_strategy(FakeRedis())
+        rs.update_runtime_settings({"dedup": {"strategy": "sha256", "ttl_seconds": 200}})
+        s2 = get_dedup_strategy(FakeRedis())
+        assert s1 is not s2
diff --git a/tests/test_document_upload_api.py b/tests/test_document_upload_api.py
index 054253d..cb9d9cf 100644
--- a/tests/test_document_upload_api.py
+++ b/tests/test_document_upload_api.py
@@ -266,9 +266,15 @@ def test_upload_rejects_empty_text_after_parse(
 def test_upload_rejects_corrupted_pdf(
     client: TestClient, monkeypatch: pytest.MonkeyPatch
 ) -> None:
-    """损坏的 PDF：code=1001，message 含'文件解析失败'，未提交任务"""
+    """损坏的 PDF：code=1001，message 含'文件解析失败'或'无法从文件提取文本'，未提交任务
+
+    file_parser 插件化后：pypdf 失败被捕获并降级到 OCR；若 OCR 不可用/关闭，
+    最终返回空文本，由 upload 端点统一报 '无法从文件提取文本'。
+    关闭 OCR 避免触发 rapidocr 模型下载拖慢测试。
+    """
     manager = FakeManager()
     _inject_manager(monkeypatch, manager)
+    monkeypatch.setattr(document_module.settings, "pdf_ocr_enabled", False)
 
     resp = client.post(
         "/api/v1/documents/upload",
@@ -277,7 +283,7 @@ def test_upload_rejects_corrupted_pdf(
 
     body = resp.json()
     assert body["code"] == 1001
-    assert "文件解析失败" in body["message"]
+    assert "文件解析失败" in body["message"] or "无法从文件提取文本" in body["message"]
     assert manager.submitted == []
 
 
diff --git a/tests/test_file_parser.py b/tests/test_file_parser.py
index 8f7cb4a..01a349f 100644
--- a/tests/test_file_parser.py
+++ b/tests/test_file_parser.py
@@ -111,10 +111,17 @@ def test_parse_file_no_extension_raises() -> None:
         parse_file("noext", b"text")
 
 
-def test_parse_file_corrupted_pdf_raises() -> None:
-    """损坏的 PDF 抛 ValueError，message 含'文件解析失败'"""
-    with pytest.raises(ValueError, match=r"文件解析失败"):
-        parse_file("bad.pdf", b"not a real pdf")
+def test_parse_file_corrupted_pdf_returns_empty(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    """损坏的 PDF：插件化后文本层提取失败被捕获，OCR 关闭时返回空字符串
+
+    原 test_parse_file_corrupted_pdf_raises 期望 ValueError，但插件化重构后
+    file_parser 设计为优雅降级（pypdf 失败 → OCR 兜底 → 都失败返回空），
+    不再向上抛异常。关闭 OCR 避免触发 rapidocr 模型下载拖慢测试。
+    """
+    monkeypatch.setattr(settings, "pdf_ocr_enabled", False)
+    assert parse_file("bad.pdf", b"not a real pdf") == ""
 
 
 def test_parse_file_empty_html_returns_empty_string() -> None:
@@ -152,12 +159,23 @@ def test_supported_extensions_contains_expected_set() -> None:
 
 @pytest.fixture(autouse=True)
 def _reset_ocr_state() -> Any:
-    """每个 OCR 测试前后重置模块级 OCR 引擎状态，避免相互污染"""
-    saved_engine = fp_module._ocr_engine
-    saved_unavailable = fp_module._ocr_unavailable
+    """每个 OCR 测试前后重置 RapidocrOcrEngine/TesseractOcrEngine 类级状态与插件缓存
+
+    file_parser 插件化后，模块级 _ocr_engine/_ocr_unavailable 已移除，
+    RapidocrOcrEngine 用类级字段 _engine/_unavailable 单例化。
+    测试前重置为干净状态（避免上个测试残留），测试后清理插件缓存。
+    """
+    # 测试前：重置为干净状态
+    fp_module.RapidocrOcrEngine._engine = None
+    fp_module.RapidocrOcrEngine._unavailable = False
+    fp_module.TesseractOcrEngine._unavailable = False
+    fp_module._ocr_plugin_cache.clear()
     yield
-    fp_module._ocr_engine = saved_engine
-    fp_module._ocr_unavailable = saved_unavailable
+    # 测试后：再次清理，避免污染后续非 OCR 测试
+    fp_module.RapidocrOcrEngine._engine = None
+    fp_module.RapidocrOcrEngine._unavailable = False
+    fp_module.TesseractOcrEngine._unavailable = False
+    fp_module._ocr_plugin_cache.clear()
 
 
 class _FakeTextPage:
@@ -281,7 +299,7 @@ def test_parse_pdf_ocr_returns_empty_when_dependency_unavailable(
     monkeypatch.setattr(settings, "pdf_ocr_enabled", True)
 
     assert parse_file("scan.pdf", b"fake pdf bytes") == ""
-    assert fp_module._ocr_unavailable is True
+    assert fp_module.RapidocrOcrEngine._unavailable is True
 
 
 def test_parse_pdf_ocr_runtime_exception_falls_back_to_empty(
@@ -324,4 +342,4 @@ def test_parse_pdf_text_layer_present_skips_ocr(
 
     result = parse_file("text.pdf", b"fake pdf bytes")
     assert result == "这是文本层的内容"
-    assert fp_module._ocr_engine is None
+    assert fp_module.RapidocrOcrEngine._engine is None
diff --git a/tests/test_ingest_tasks.py b/tests/test_ingest_tasks.py
index 667cef0..b9af79e 100644
--- a/tests/test_ingest_tasks.py
+++ b/tests/test_ingest_tasks.py
@@ -227,7 +227,11 @@ async def test_get_falls_back_to_redis_then_none() -> None:
 
 
 def _text_hash(text: str) -> str:
-    return hashlib.sha256(text.encode("utf-8")).hexdigest()
+    """构造与 Sha256DedupStrategy 一致的 dedup key
+
+    dedup 模块化后 key 形如 dedup:sha256:<sha256hex>（前缀 + 策略名 + hash）。
+    """
+    return f"sha256:{hashlib.sha256(text.encode('utf-8')).hexdigest()}"
 
 
 async def test_dedup_hit_reuses_old_doc_id_and_skips_pipeline() -> None:
diff --git a/tests/test_llm_factory.py b/tests/test_llm_factory.py
new file mode 100644
index 0000000..3f86b27
--- /dev/null
+++ b/tests/test_llm_factory.py
@@ -0,0 +1,295 @@
+"""LLM 工厂与客户端单元测试：mock httpx 验证 Ollama / OpenAICompatible 两条路径 + 缓存
+
+通过 monkeypatch 替换 `httpx.AsyncClient` 为伪造的上下文管理器，避免真实网络请求。
+"""
+
+import httpx
+import pytest
+from unittest.mock import AsyncMock
+
+from app.core import runtime_settings as rs
+from app.services import llm as llm_mod
+from app.services.llm import (
+    LLMClient,
+    OllamaLLMClient,
+    OpenAICompatibleLLMClient,
+    create_llm_client,
+    invalidate_llm_client_cache,
+)
+
+
+# ---------------------------------------------------------------------------- #
+# httpx 伪造工具
+# ---------------------------------------------------------------------------- #
+
+
+class _FakeResponse:
+    def __init__(self, status_code: int = 200, json_data: dict | None = None) -> None:
+        self.status_code = status_code
+        self._json = json_data or {}
+
+    def raise_for_status(self) -> None:
+        if self.status_code >= 400:
+            raise httpx.HTTPStatusError(
+                f"HTTP {self.status_code}", request=httpx.Request("POST", "http://x"), response=self
+            )
+
+    def json(self) -> dict:
+        return self._json
+
+
+class _FakeAsyncClient:
+    """伪造 httpx.AsyncClient 上下文管理器
+
+    用法：把 _FakeAsyncClient.next_response 设为期望响应，构造后 post/get 返回该响应。
+    每次 __init__ 记录构造参数到 _FakeAsyncClient.last_kwargs。
+    """
+
+    next_response: _FakeResponse | None = None
+    last_kwargs: dict | None = None
+    last_instances: list["_FakeAsyncClient"] = []
+
+    def __init__(self, *args, **kwargs) -> None:
+        self.post = AsyncMock()
+        self.get = AsyncMock()
+        if _FakeAsyncClient.next_response is not None:
+            self.post.return_value = _FakeAsyncClient.next_response
+            self.get.return_value = _FakeAsyncClient.next_response
+        _FakeAsyncClient.last_kwargs = kwargs
+        _FakeAsyncClient.last_instances.append(self)
+
+    async def __aenter__(self) -> "_FakeAsyncClient":
+        return self
+
+    async def __aexit__(self, *args) -> bool:
+        return False
+
+    @classmethod
+    def reset(cls) -> None:
+        cls.next_response = None
+        cls.last_kwargs = None
+        cls.last_instances = []
+
+
+@pytest.fixture
+def patch_httpx(monkeypatch: pytest.MonkeyPatch):
+    """替换 httpx.AsyncClient 为伪造客户端"""
+    _FakeAsyncClient.reset()
+    monkeypatch.setattr(llm_mod.httpx, "AsyncClient", _FakeAsyncClient)
+    # ollama 模块内 OllamaClient 也用 httpx.AsyncClient
+    from app.services import ollama as ollama_mod
+    monkeypatch.setattr(ollama_mod.httpx, "AsyncClient", _FakeAsyncClient)
+    yield _FakeAsyncClient
+    _FakeAsyncClient.reset()
+
+
+@pytest.fixture
+def isolated_settings_path(tmp_path, monkeypatch: pytest.MonkeyPatch):
+    path = tmp_path / "runtime_settings.json"
+    monkeypatch.setenv("RUNTIME_SETTINGS_PATH", str(path))
+    rs._runtime_settings = None
+    invalidate_llm_client_cache()
+    yield path
+    rs._runtime_settings = None
+    invalidate_llm_client_cache()
+
+
+# ---------------------------------------------------------------------------- #
+# OllamaLLMClient
+# ---------------------------------------------------------------------------- #
+
+
+class TestOllamaLLMClient:
+    async def test_generate_returns_response_field(self, patch_httpx):
+        """Ollama 响应：取 data['response'] 字段"""
+        patch_httpx.next_response = _FakeResponse(
+            json_data={"response": "你好世界", "model": "qwen2.5:1.5b"}
+        )
+        client = OllamaLLMClient(base_url="http://ollama:11434", model="qwen2.5:1.5b")
+        out = await client.generate("prompt")
+        assert out == "你好世界"
+        # 校验请求 url 与 payload
+        fake = patch_httpx.last_instances[-1]
+        fake.post.assert_awaited_once()
+        call_args = fake.post.await_args
+        assert call_args.args[0] == "http://ollama:11434/api/generate"
+        payload = call_args.kwargs["json"]
+        assert payload["model"] == "qwen2.5:1.5b"
+        assert payload["prompt"] == "prompt"
+        assert payload["stream"] is False
+
+    async def test_generate_json_mode_adds_format(self, patch_httpx):
+        patch_httpx.next_response = _FakeResponse(json_data={"response": "{}"})
+        client = OllamaLLMClient(base_url="http://o:11434", model="m")
+        await client.generate("p", json_mode=True)
+        payload = patch_httpx.last_instances[-1].post.await_args.kwargs["json"]
+        assert payload["format"] == "json"
+
+    async def test_is_available_true(self, patch_httpx):
+        patch_httpx.next_response = _FakeResponse(status_code=200)
+        client = OllamaLLMClient(base_url="http://o:11434", model="m")
+        assert await client.is_available() is True
+
+    async def test_is_available_false_on_http_error(self, monkeypatch):
+        """httpx 抛 HTTPError 时 OllamaClient 内部捕获返回 False，OllamaLLMClient 透传"""
+
+        class _RaisingClient:
+            async def __aenter__(self):
+                return self
+
+            async def __aexit__(self, *args):
+                return False
+
+            async def get(self, *args, **kwargs):
+                raise httpx.HTTPError("conn refused")
+
+        from app.services import ollama as ollama_mod
+
+        monkeypatch.setattr(ollama_mod.httpx, "AsyncClient", lambda *a, **kw: _RaisingClient())
+        client = OllamaLLMClient(base_url="http://o:11434", model="m")
+        assert await client.is_available() is False
+
+
+# ---------------------------------------------------------------------------- #
+# OpenAICompatibleLLMClient
+# ---------------------------------------------------------------------------- #
+
+
+class TestOpenAICompatibleClient:
+    async def test_generate_returns_choices_content(self, patch_httpx):
+        patch_httpx.next_response = _FakeResponse(
+            json_data={"choices": [{"message": {"content": "答案"}}]}
+        )
+        client = OpenAICompatibleLLMClient(
+            base_url="https://api.openai.com/v1", api_key="sk-x", model="gpt-4o-mini"
+        )
+        out = await client.generate("hello")
+        assert out == "答案"
+        fake = patch_httpx.last_instances[-1]
+        call_args = fake.post.await_args
+        assert call_args.args[0] == "https://api.openai.com/v1/chat/completions"
+        payload = call_args.kwargs["json"]
+        assert payload["model"] == "gpt-4o-mini"
+        assert payload["messages"] == [{"role": "user", "content": "hello"}]
+        assert payload["stream"] is False
+        # Authorization header
+        headers = call_args.kwargs["headers"]
+        assert headers["Authorization"] == "Bearer sk-x"
+
+    async def test_generate_json_mode_adds_response_format(self, patch_httpx):
+        patch_httpx.next_response = _FakeResponse(
+            json_data={"choices": [{"message": {"content": "{}"}}]}
+        )
+        client = OpenAICompatibleLLMClient(
+            base_url="https://api.openai.com/v1", api_key="sk-x", model="m"
+        )
+        await client.generate("p", json_mode=True)
+        payload = patch_httpx.last_instances[-1].post.await_args.kwargs["json"]
+        assert payload["response_format"] == {"type": "json_object"}
+
+    async def test_generate_empty_choices_returns_empty(self, patch_httpx):
+        patch_httpx.next_response = _FakeResponse(json_data={"choices": []})
+        client = OpenAICompatibleLLMClient(
+            base_url="https://api.openai.com/v1", api_key="sk-x", model="m"
+        )
+        assert await client.generate("p") == ""
+
+    async def test_is_available_true(self, patch_httpx):
+        patch_httpx.next_response = _FakeResponse(status_code=200)
+        client = OpenAICompatibleLLMClient(
+            base_url="https://api.openai.com/v1", api_key="sk-x", model="m"
+        )
+        assert await client.is_available() is True
+
+    async def test_is_available_false_on_http_error(self, monkeypatch):
+        """httpx 抛 HTTPError 时返回 False"""
+        client = OpenAICompatibleLLMClient(
+            base_url="https://api.openai.com/v1", api_key="sk-x", model="m"
+        )
+
+        class _Raiser:
+            async def __aenter__(self):
+                raise httpx.HTTPError("conn refused")
+
+            async def __aexit__(self, *args):
+                return False
+
+        monkeypatch.setattr(llm_mod.httpx, "AsyncClient", lambda *a, **kw: _Raiser())
+        assert await client.is_available() is False
+
+
+# ---------------------------------------------------------------------------- #
+# 工厂
+# ---------------------------------------------------------------------------- #
+
+
+class TestFactory:
+    def test_ollama_provider_returns_ollama_client(self, isolated_settings_path):
+        """runtime_settings 默认 provider=ollama，工厂返回 OllamaLLMClient"""
+        # 确保配置走 ollama（默认即 ollama）
+        client = create_llm_client("summarize", use_cache=False)
+        assert isinstance(client, OllamaLLMClient)
+
+    def test_openai_compatible_provider_returns_openai_client(
+        self, isolated_settings_path
+    ):
+        rs.update_runtime_settings(
+            {"models": {"query": {"provider": "openai_compatible", "api_key": "sk-x", "model": "gpt-4o-mini"}}}
+        )
+        client = create_llm_client("query", use_cache=False)
+        assert isinstance(client, OpenAICompatibleLLMClient)
+        assert client.model == "gpt-4o-mini"
+        assert client.api_key == "sk-x"
+
+    def test_openai_compatible_falls_back_to_settings(self, isolated_settings_path):
+        """openai_compatible 时 base_url/api_key 为空用 settings 默认；model 为空用 gpt-4o-mini"""
+        # 显式置空 model 以触发工厂默认值（env fallback 会预填 ollama_model）
+        rs.update_runtime_settings(
+            {"models": {"classify": {"provider": "openai_compatible", "model": ""}}}
+        )
+        from app.config import settings
+
+        client = create_llm_client("classify", use_cache=False)
+        assert isinstance(client, OpenAICompatibleLLMClient)
+        assert client.api_key == settings.openai_api_key
+        assert client.model == "gpt-4o-mini"  # openai_compatible 默认模型
+
+    def test_cache_returns_same_instance(self, isolated_settings_path):
+        """use_cache=True 时同 purpose 复用单例"""
+        c1 = create_llm_client("summarize")
+        c2 = create_llm_client("summarize")
+        assert c1 is c2
+
+    def test_cache_different_purposes_different_instances(self, isolated_settings_path):
+        c1 = create_llm_client("summarize")
+        c2 = create_llm_client("query")
+        assert c1 is not c2
+
+    def test_no_cache_returns_new_instance_each_call(self, isolated_settings_path):
+        c1 = create_llm_client("summarize", use_cache=False)
+        c2 = create_llm_client("summarize", use_cache=False)
+        assert c1 is not c2
+
+    def test_invalidate_clears_cache(self, isolated_settings_path):
+        c1 = create_llm_client("summarize")
+        invalidate_llm_client_cache()
+        c2 = create_llm_client("summarize")
+        assert c1 is not c2
+
+    def test_invalidate_single_purpose(self, isolated_settings_path):
+        c_sum = create_llm_client("summarize")
+        c_qry = create_llm_client("query")
+        invalidate_llm_client_cache("summarize")
+        # summarize 已清，query 未清
+        assert create_llm_client("summarize") is not c_sum
+        assert create_llm_client("query") is c_qry
+
+    def test_client_implements_protocol(self, isolated_settings_path):
+        """OllamaLLMClient 与 OpenAICompatibleLLMClient 都满足 LLMClient Protocol"""
+        c1 = create_llm_client("summarize", use_cache=False)
+        assert isinstance(c1, LLMClient)
+        rs.update_runtime_settings(
+            {"models": {"summarize": {"provider": "openai_compatible", "api_key": "k"}}}
+        )
+        c2 = create_llm_client("summarize", use_cache=False)
+        assert isinstance(c2, LLMClient)
diff --git a/tests/test_runtime_settings.py b/tests/test_runtime_settings.py
new file mode 100644
index 0000000..a6c2b9d
--- /dev/null
+++ b/tests/test_runtime_settings.py
@@ -0,0 +1,254 @@
+"""RuntimeSettings 单元测试：默认值 / 加载 / 保存 / 部分更新 / 重置 / 单例
+
+每个测试通过 monkeypatch 把 RUNTIME_SETTINGS_PATH 指向独立临时文件，并在前后
+重置模块级 `_runtime_settings` 单例，避免跨测试串扰。
+"""
+
+import json
+from pathlib import Path
+
+import pytest
+
+from app.core import runtime_settings as rs
+
+
+@pytest.fixture
+def isolated_settings_path(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> Path:
+    """每个测试独立持久化路径，并在前后清空模块级单例"""
+    path = tmp_path / "runtime_settings.json"
+    monkeypatch.setenv("RUNTIME_SETTINGS_PATH", str(path))
+    # 重置单例，强制下次 get_runtime_settings 重新加载
+    rs._runtime_settings = None
+    yield path
+    rs._runtime_settings = None
+
+
+# ---------------------------------------------------------------------------- #
+# 默认值
+# ---------------------------------------------------------------------------- #
+
+
+class TestDefaults:
+    def test_default_models_provider_is_ollama(self):
+        cfg = rs.RuntimeSettings()
+        assert cfg.models.summarize.provider == "ollama"
+        assert cfg.models.query.provider == "ollama"
+        assert cfg.models.classify.provider == "ollama"
+
+    def test_default_parsers_plugins(self):
+        cfg = rs.RuntimeSettings()
+        assert cfg.parsers.ocr.plugin == "rapidocr"
+        assert cfg.parsers.pdf.plugin == "pypdf"
+        assert cfg.parsers.docx.plugin == "python_docx"
+
+    def test_default_dedup(self):
+        cfg = rs.RuntimeSettings()
+        assert cfg.dedup.strategy == "sha256"
+        assert cfg.dedup.simhash_threshold == 3
+        assert cfg.dedup.ttl_seconds == 86400
+
+    def test_default_with_env_fallback_uses_ollama_env(self):
+        """无持久化文件时，base_url/model 取自 settings.ollama_*"""
+        cfg = rs._default_with_env_fallback()
+        from app.config import settings
+
+        assert cfg.models.summarize.base_url == settings.ollama_base_url
+        assert cfg.models.summarize.model == settings.ollama_model
+        assert cfg.models.query.base_url == settings.ollama_base_url
+        assert cfg.models.classify.model == settings.ollama_model
+
+
+# ---------------------------------------------------------------------------- #
+# 加载
+# ---------------------------------------------------------------------------- #
+
+
+class TestLoad:
+    def test_missing_file_returns_env_fallback(self, isolated_settings_path: Path):
+        """文件不存在时回退到带 env 兜底的默认值（不抛异常）"""
+        assert not isolated_settings_path.exists()
+        cfg = rs.load_runtime_settings()
+        # base_url 应来自 env fallback
+        from app.config import settings
+
+        assert cfg.models.summarize.base_url == settings.ollama_base_url
+
+    def test_valid_file_parsed(self, isolated_settings_path: Path):
+        isolated_settings_path.write_text(
+            json.dumps(
+                {
+                    "models": {
+                        "summarize": {"provider": "openai_compatible", "model": "gpt-4o-mini", "api_key": "k"}
+                    },
+                    "dedup": {"strategy": "simhash", "simhash_threshold": 5},
+                }
+            ),
+            encoding="utf-8",
+        )
+        cfg = rs.load_runtime_settings()
+        assert cfg.models.summarize.provider == "openai_compatible"
+        assert cfg.models.summarize.model == "gpt-4o-mini"
+        assert cfg.models.summarize.api_key == "k"
+        assert cfg.dedup.strategy == "simhash"
+        assert cfg.dedup.simhash_threshold == 5
+        # 未指定的字段保留默认
+        assert cfg.dedup.ttl_seconds == 86400
+        assert cfg.models.query.provider == "ollama"
+
+    def test_corrupted_file_falls_back(self, isolated_settings_path: Path):
+        isolated_settings_path.write_text("not-json{", encoding="utf-8")
+        cfg = rs.load_runtime_settings()
+        # 回退到默认（ollama provider）
+        assert cfg.models.summarize.provider == "ollama"
+
+    def test_invalid_values_falls_back(self, isolated_settings_path: Path):
+        """字段值非法（如未知 provider）时整体回退默认"""
+        isolated_settings_path.write_text(
+            json.dumps({"models": {"summarize": {"provider": "unknown_provider"}}}),
+            encoding="utf-8",
+        )
+        cfg = rs.load_runtime_settings()
+        assert cfg.models.summarize.provider == "ollama"  # 回退默认
+
+
+# ---------------------------------------------------------------------------- #
+# 保存
+# ---------------------------------------------------------------------------- #
+
+
+class TestSave:
+    def test_save_writes_valid_json(self, isolated_settings_path: Path):
+        cfg = rs.RuntimeSettings()
+        cfg.dedup.strategy = "simhash"
+        rs.save_runtime_settings(cfg)
+        assert isolated_settings_path.exists()
+        data = json.loads(isolated_settings_path.read_text(encoding="utf-8"))
+        assert data["dedup"]["strategy"] == "simhash"
+
+    def test_save_creates_parent_dir(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch):
+        path = tmp_path / "nested" / "deep" / "runtime_settings.json"
+        monkeypatch.setenv("RUNTIME_SETTINGS_PATH", str(path))
+        rs.save_runtime_settings(rs.RuntimeSettings())
+        assert path.exists()
+
+    def test_save_atomic_no_tmp_left(self, isolated_settings_path: Path):
+        """保存后同目录无残留 .tmp 临时文件"""
+        rs.save_runtime_settings(rs.RuntimeSettings())
+        tmps = list(isolated_settings_path.parent.glob(".runtime_settings.*.tmp"))
+        assert tmps == []
+
+
+# ---------------------------------------------------------------------------- #
+# 单例 + reload
+# ---------------------------------------------------------------------------- #
+
+
+class TestSingleton:
+    def test_get_returns_singleton(self, isolated_settings_path: Path):
+        cfg1 = rs.get_runtime_settings()
+        cfg2 = rs.get_runtime_settings()
+        assert cfg1 is cfg2
+
+    def test_reload_rereads_disk(self, isolated_settings_path: Path):
+        """reload 强制重新读盘，单例替换为新对象"""
+        cfg1 = rs.get_runtime_settings()
+        # 直接改盘上文件
+        isolated_settings_path.write_text(
+            json.dumps({"dedup": {"strategy": "none"}}), encoding="utf-8"
+        )
+        cfg2 = rs.reload_runtime_settings()
+        assert cfg2 is not cfg1
+        assert cfg2.dedup.strategy == "none"
+
+
+# ---------------------------------------------------------------------------- #
+# 部分更新（深合并）
+# ---------------------------------------------------------------------------- #
+
+
+class TestUpdate:
+    def test_partial_update_models_summarize(self, isolated_settings_path: Path):
+        rs.get_runtime_settings()  # 初始化单例
+        new_cfg = rs.update_runtime_settings(
+            {"models": {"summarize": {"model": "qwen2.5:3b"}}}
+        )
+        assert new_cfg.models.summarize.model == "qwen2.5:3b"
+        # 其他字段保留
+        assert new_cfg.models.summarize.provider == "ollama"
+        assert new_cfg.models.query.provider == "ollama"
+
+    def test_partial_update_dedup(self, isolated_settings_path: Path):
+        rs.get_runtime_settings()
+        new_cfg = rs.update_runtime_settings(
+            {"dedup": {"strategy": "simhash", "simhash_threshold": 5}}
+        )
+        assert new_cfg.dedup.strategy == "simhash"
+        assert new_cfg.dedup.simhash_threshold == 5
+        # ttl 未在 patch 中，保留默认
+        assert new_cfg.dedup.ttl_seconds == 86400
+
+    def test_update_persists_to_disk(self, isolated_settings_path: Path):
+        rs.get_runtime_settings()
+        rs.update_runtime_settings({"dedup": {"strategy": "none"}})
+        data = json.loads(isolated_settings_path.read_text(encoding="utf-8"))
+        assert data["dedup"]["strategy"] == "none"
+
+    def test_update_replaces_singleton(self, isolated_settings_path: Path):
+        old = rs.get_runtime_settings()
+        new = rs.update_runtime_settings({"dedup": {"strategy": "none"}})
+        assert new is not old
+        # 后续 get 拿到的是新单例
+        assert rs.get_runtime_settings() is new
+
+    def test_update_empty_patch_keeps_all(self, isolated_settings_path: Path):
+        """空 patch 不改变任何字段"""
+        rs.get_runtime_settings()
+        new_cfg = rs.update_runtime_settings({})
+        assert new_cfg.dedup.strategy == "sha256"
+
+
+# ---------------------------------------------------------------------------- #
+# 重置
+# ---------------------------------------------------------------------------- #
+
+
+class TestReset:
+    def test_reset_returns_defaults(self, isolated_settings_path: Path):
+        # 先污染
+        rs.get_runtime_settings()
+        rs.update_runtime_settings({"dedup": {"strategy": "none"}})
+        assert rs.get_runtime_settings().dedup.strategy == "none"
+        # 重置
+        cfg = rs.reset_runtime_settings()
+        assert cfg.dedup.strategy == "sha256"
+        assert cfg.dedup.simhash_threshold == 3
+        assert cfg.parsers.ocr.plugin == "rapidocr"
+
+    def test_reset_persists_to_disk(self, isolated_settings_path: Path):
+        rs.get_runtime_settings()
+        rs.update_runtime_settings({"dedup": {"strategy": "none"}})
+        rs.reset_runtime_settings()
+        data = json.loads(isolated_settings_path.read_text(encoding="utf-8"))
+        assert data["dedup"]["strategy"] == "sha256"
+
+
+# ---------------------------------------------------------------------------- #
+# 深合并工具函数
+# ---------------------------------------------------------------------------- #
+
+
+class TestDeepMerge:
+    def test_nested_dict_merged(self):
+        target = {"a": {"b": 1, "c": 2}, "d": 3}
+        rs._deep_merge(target, {"a": {"b": 10}})
+        assert target == {"a": {"b": 10, "c": 2}, "d": 3}
+
+    def test_non_dict_overrides(self):
+        target = {"a": {"b": 1}}
+        rs._deep_merge(target, {"a": 99})
+        assert target == {"a": 99}
+
+    def test_new_key_added(self):
+        target = {"a": 1}
+        rs._deep_merge(target, {"b": 2})
+        assert target == {"a": 1, "b": 2}