feat: migrate prosappco from Firebase to NestJS REST API (Fase 2)

- 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>

pubspec.yaml

@@ -18,17 +18,12 @@ dependencies:
   cloud_firestore: ^4.15.4
   community_material_icon: ^5.9.55
   cupertino_icons: ^1.0.2
-  diacritic: null
+  diacritic: ^0.1.5
   equatable: ^2.0.5
   file_picker: ^8.0.3
-  firebase_auth: ^4.17.4
-  firebase_core: ^2.25.4
-  firebase_messaging: ^14.8.2
-  firebase_messaging_web: ^3.8.2
-  firebase_storage_web: ^3.9.7
   flutter:
     sdk: flutter
-  flutter_animate: null
+  flutter_animate: ^4.5.0
   flutter_bloc: ^8.1.4
   flutter_dialogs: ^3.0.0
   flutter_email_sender: ^6.0.3
@@ -42,7 +37,6 @@ dependencies:
   geocoding: ^3.0.0
   geolocator: ^12.0.0
   google_maps_flutter: ^2.5.0
-  google_sign_in: ^6.1.4
   http: ^1.1.0
   image_picker: ^1.0.7
   injector: ^3.0.0
@@ -65,7 +59,7 @@ dependencies:
     path: packages/setting_repository
   shared_preferences: ^2.0.10
   shimmer: ^3.0.0
-  table_calendar: null
+  table_calendar: ^3.1.1
   universal_html: ^2.2.3
   url_launcher: ^6.1.10
   user_repository: