- Show local notification (sound + vibrate) when chat_request arrives
via WebSocket while mitra app is backgrounded
- Add NotificationService.showLocalNotification() for programmatic use
- Fix router redirect: don't redirect auth routes to splash during loading
- Handle binary/string WebSocket frames in ChatRequestNotifier
- Remove debug logging from backend and Flutter
- Control center: mitra ping config UI
- Both apps: dynamic ping, FCM deep-linking, unread badges
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>