Initial commit: QMDSearch 分层信息检索服务

- FastAPI + Qdrant + Redis + Ollama 技术栈
- L1→L2→L3→chunk 四层分层检索（dense + sparse RRF 融合）
- 文档三级总结与 2.5 级回退
- query 解析路由与分类
- /admin 管理页面

tests/test_knowledge_api.py

@@ -0,0 +1,38 @@
+"""知识分类 API 测试（Qdrant 为 mock，不真实联网）"""
+
+from collections.abc import Iterator
+
+import pytest
+from fastapi.testclient import TestClient
+
+from app.main import app
+from app.models.knowledge import UNCATEGORIZED, load_taxonomy
+from app.services.qdrant import QdrantService
+
+
+@pytest.fixture
+def client(monkeypatch: pytest.MonkeyPatch) -> Iterator[TestClient]:
+    """TestClient，lifespan 中的 Qdrant 集合初始化替换为空操作"""
+
+    async def _noop_ensure_collections(self: QdrantService) -> None:
+        return None
+
+    monkeypatch.setattr(QdrantService, "ensure_collections", _noop_ensure_collections)
+    with TestClient(app) as test_client:
+        yield test_client
+
+
+def test_list_categories(client: TestClient) -> None:
+    """categories 返回完整 taxonomy，且含 uncategorized"""
+    resp = client.get("/api/v1/knowledge/categories")
+
+    assert resp.status_code == 200
+    body = resp.json()
+    assert body["code"] == 0
+
+    expected = load_taxonomy()
+    data = body["data"]
+    assert data["count"] == len(expected)
+    names = [c["name"] for c in data["categories"]]
+    assert names == [c.name for c in expected]
+    assert UNCATEGORIZED in names