- Add firebase_core + firebase_messaging to pubspec.yaml
- Initialize Firebase in main.dart before runApp
- NotificationBloc: request permission, get FCM token, register with
backend (PATCH /users/me/fcm-token), show local notification on
foreground messages, refresh token on rotation
- app_view.dart: call initializePushNotifications() on authenticated state
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- Replace all Firebase* repositories with Api* repositories using HTTP + SharedPreferences JWT
- Remove Firebase.initializeApp() and firebase_messaging background handler from main.dart
- Update DI (app_di.dart) to inject Api* repositories instead of Firebase* ones
- Replace all Timestamp/cloud_firestore usage with ISO 8601 String dates
- Stub PhoneVerificationService (Firebase phone OTP → backend OTP when implemented)
- Add ApiService singleton with JWT management in lib/services/
- Legacy firebase_*_repository.dart files preserved for Fase 4 cleanup
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
