🔗 API Endpoints
POST /api/ping {"device_id":"..","device_name":"Mi 10T Pro","version":"3.8.3"}
GET /api/stats -> {"online":5,"total":20,"today":12,"pro_count":3}
GET /api/users -> [{"device_name":"..","online":true,"perm_pro":true,..}]
POST /api/permissions/set {"device_id":"..","feature":"pro|ringtones|notifications_count","enabled":true|2}
GET /api/permissions/<device_id> -> {"pro":true,"notifications_count":2,"ringtones":false}
GET /api/license/<device_id> -> {"licensed":true} (for app license check)