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

AGENTS.md

@@ -57,6 +57,22 @@ python -m app.seed
 uvicorn app.main:app --host 0.0.0.0 --port 4000 --reload
 ```
 
+手动重启 4001 端口服务：先停止当前监听进程及其 worker，再手动运行 API。
+
+```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
+```
+
+
 Docker 全量启动：
 
 ```bash