Maintenance API

Method	Path	Auth	Summary	Source
POST	/api/maintenance/start	super_admin	Create / execute maintenance — start	system/maintenanceRoutes.ts
GET	/api/maintenance/status	public	List maintenance — status	system/maintenanceRoutes.ts
POST	/api/maintenance/stop	super_admin	Create / execute maintenance — stop	system/maintenanceRoutes.ts