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>

lib/screens/lists/professional_list_screen.dart

@@ -1,4 +1,5 @@
-import 'package:firebase_auth/firebase_auth.dart';
+import 'package:user_repository/user_repository.dart';
+
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
@@ -173,13 +174,13 @@ class _ProfessionalListScreenState extends State<ProfessionalListScreen> {
               .toLowerCase()
               .contains(removeDiacritics(_searchController.text.toLowerCase())))
           .where((user) =>
-              user.myUser.id != FirebaseAuth.instance.currentUser!.uid)
+              user.myUser.id != ApiUserRepository.currentUserId ?? '')
           .where(
               (user) => user.professionalInfo.profession == _selectedProfession)
           .toList();
       // } else {
       //   filteredUsers = state.users
-      //       // .where((user) => user.myUser.id != FirebaseAuth.instance.currentUser!.uid)
+      //       // .where((user) => user.myUser.id != ApiUserRepository.currentUserId ?? '')
       //       .toList();
       // }