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_response.py

@@ -0,0 +1,42 @@
+"""统一 API 响应包装与业务异常单元测试"""
+
+import pytest
+
+from app.api.response import ApiError, error, ok
+
+
+class TestOk:
+    def test_ok_structure(self) -> None:
+        data = {"items": [1, 2, 3]}
+        assert ok(data) == {"code": 0, "data": {"items": [1, 2, 3]}, "message": "ok"}
+
+    def test_ok_none_data(self) -> None:
+        assert ok(None) == {"code": 0, "data": None, "message": "ok"}
+
+
+class TestError:
+    def test_error_structure(self) -> None:
+        assert error(1004, "文档不存在") == {"code": 1004, "data": None, "message": "文档不存在"}
+
+    def test_error_code_passthrough(self) -> None:
+        result = error(2000, "服务器内部错误")
+        assert result["code"] == 2000
+        assert result["message"] == "服务器内部错误"
+
+
+class TestApiError:
+    def test_attributes(self) -> None:
+        exc = ApiError(1004, "文档不存在")
+        assert exc.code == 1004
+        assert exc.message == "文档不存在"
+
+    def test_is_exception_with_message(self) -> None:
+        exc = ApiError(1004, "文档不存在")
+        assert isinstance(exc, Exception)
+        assert str(exc) == "文档不存在"
+
+    def test_raise_and_catch(self) -> None:
+        with pytest.raises(ApiError) as exc_info:
+            raise ApiError(1001, "请求参数校验失败")
+        assert exc_info.value.code == 1001
+        assert exc_info.value.message == "请求参数校验失败"