feat: add hotel and vehicle option site modules

Add full support for hotel group and vehicle option site management features:
- Define SQLAlchemy models and alembic migration for the new database tables
- Add default sample content entries in content.py
- Extend admin and public API routes to support the new modules
- Update seed script to populate default hotel and vehicle data
- Update all relevant documentation and test cases

README.md

@@ -85,6 +85,21 @@ python -m app.seed --no-reset
 uvicorn app.main:app --host 0.0.0.0 --port 4000 --reload
 ```
 
+如果需要手动重启 4001 端口服务，先释放端口，再重新运行：
+
+```powershell
+$port = 4001
+$listenerPids = Get-NetTCPConnection -LocalPort $port -State Listen -ErrorAction SilentlyContinue |
+  Select-Object -ExpandProperty OwningProcess -Unique
+foreach ($listenerPid in $listenerPids) {
+  Get-CimInstance Win32_Process |
+    Where-Object { $_.ParentProcessId -eq $listenerPid } |
+    ForEach-Object { Stop-Process -Id $_.ProcessId -Force -ErrorAction SilentlyContinue }
+  Stop-Process -Id $listenerPid -Force -ErrorAction SilentlyContinue
+}
+uvicorn app.main:app --host 0.0.0.0 --port 4001 --reload
+```
+
 启动后访问：
 
 - 健康检查：http://localhost:4000/health
@@ -141,15 +156,15 @@ python -m app.seed
 
 ## 常用命令
 
-| 命令 | 说明 |
-| --- | --- |
-| `uvicorn app.main:app --reload --port 4000` | 启动开发服务 |
-| `alembic upgrade head` | 创建或升级数据库结构 |
-| `alembic stamp head` | 标记已有数据库已处于当前 baseline |
-| `python -m app.seed` | 重置并导入初始化内容 |
-| `python -m app.seed --no-reset` | 只确保默认后台账号存在 |
-| `pytest` | 运行测试 |
-| `docker compose up --build` | 构建并启动完整服务 |
+| 命令                                        | 说明                              |
+| ------------------------------------------- | --------------------------------- |
+| `uvicorn app.main:app --reload --port 4000` | 启动开发服务                      |
+| `alembic upgrade head`                      | 创建或升级数据库结构              |
+| `alembic stamp head`                        | 标记已有数据库已处于当前 baseline |
+| `python -m app.seed`                        | 重置并导入初始化内容              |
+| `python -m app.seed --no-reset`             | 只确保默认后台账号存在            |
+| `pytest`                                    | 运行测试                          |
+| `docker compose up --build`                 | 构建并启动完整服务                |
 
 ## API 兼容范围