Add unit tests for models and services

- Implemented unit tests for Object model including folder and file creation, properties, and path retrieval.
- Added unit tests for Setting model covering creation, unique constraints, and type enumeration.
- Created unit tests for User model focusing on user creation, uniqueness, and group relationships.
- Developed unit tests for Login service to validate login functionality, including 2FA and token generation.
- Added utility tests for JWT creation and verification, ensuring token integrity and expiration handling.
- Implemented password utility tests for password generation, hashing, and TOTP verification.

run_integration_tests.bat

@@ -0,0 +1,74 @@
+@echo off
+chcp 65001 >nul
+REM DiskNext Server 集成测试运行脚本
+
+echo ==================== DiskNext Server 集成测试 ====================
+echo.
+
+REM 检查 uv 是否安装
+echo 检查 uv...
+uv --version >nul 2>&1
+if errorlevel 1 (
+    echo X uv 未安装，请先安装 uv: https://docs.astral.sh/uv/
+    pause
+    exit /b 1
+)
+
+REM 同步依赖
+echo 同步依赖...
+uv sync
+echo.
+
+REM 显示测试环境信息
+echo 测试环境信息:
+uv run python --version
+uv run pytest --version
+echo.
+
+REM 运行测试
+echo ==================== 开始运行集成测试 ====================
+echo.
+
+if "%1"=="site" (
+    echo 运行站点端点测试...
+    uv run pytest tests/integration/api/test_site.py -v
+) else if "%1"=="user" (
+    echo 运行用户端点测试...
+    uv run pytest tests/integration/api/test_user.py -v
+) else if "%1"=="admin" (
+    echo 运行管理员端点测试...
+    uv run pytest tests/integration/api/test_admin.py -v
+) else if "%1"=="directory" (
+    echo 运行目录操作测试...
+    uv run pytest tests/integration/api/test_directory.py -v
+) else if "%1"=="object" (
+    echo 运行对象操作测试...
+    uv run pytest tests/integration/api/test_object.py -v
+) else if "%1"=="auth" (
+    echo 运行认证中间件测试...
+    uv run pytest tests/integration/middleware/test_auth.py -v
+) else if "%1"=="api" (
+    echo 运行所有 API 测试...
+    uv run pytest tests/integration/api/ -v
+) else if "%1"=="middleware" (
+    echo 运行所有中间件测试...
+    uv run pytest tests/integration/middleware/ -v
+) else if "%1"=="coverage" (
+    echo 运行测试并生成覆盖率报告...
+    uv run pytest tests/integration/ -v --cov --cov-report=html
+    echo.
+    echo 覆盖率报告已生成: htmlcov/index.html
+) else if "%1"=="unit" (
+    echo 运行所有单元测试...
+    uv run pytest tests/unit/ -v
+) else if "%1"=="all" (
+    echo 运行所有测试...
+    uv run pytest tests/ -v
+) else (
+    echo 运行所有集成测试...
+    uv run pytest tests/integration/ -v
+)
+
+echo.
+echo ==================== 测试完成 ====================
+pause