feat: migrate Firebase → NestJS REST API backend

Replace all Firebase SDK (Auth, Firestore, Storage) with HTTP calls
to backend.prosapp.co/api/v1:

- New ApiService singleton (JWT token, GET/POST/PATCH/DELETE/upload)
- auth_provider: Firebase Auth → /auth/login, /auth/register, /auth/phone/*
- services_provider + calendar_services_provider → /services endpoints
- professional_provider + professionals_provider → /professional-info, /users/professionals
- profile_form_provider + professional_form_provider → /users/me, /storage/upload
- cities/professions/settings providers → /cities, /professions, /settings
- firebase_chat_repository → polling via /chats endpoints (3s interval)
- firebase_score_repository → polling via /comments endpoints (10s interval)
- professional_detail_provider → /users/:id + /professional-info/:id
- dashboard_view: Firestore.add → POST /services
- chat_view + rating_view: FirebaseAuth.uid → AuthProvider.user.id
- Models: Timestamp → String for createdAt fields
- google_fonts upgraded to ^8.1.0 (Dart 3.12 compat)
- Remove firebase_core, firebase_auth, cloud_firestore, firebase_storage from pubspec

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/ui/views/chat_view.dart

@@ -1,5 +1,5 @@
-import 'package:firebase_auth/firebase_auth.dart';
 import 'package:flutter/material.dart';
+import 'package:prosapp_web_app/providers/auth_provider.dart';
 import 'package:flutter_rating_bar/flutter_rating_bar.dart';
 import 'package:intl/intl.dart';
 import 'package:prosapp_web_app/models/message_entity.dart';
@@ -131,13 +131,13 @@ class ChatView extends StatelessWidget {
                     padding: const EdgeInsets.only(top: 10),
                     reverse: true,
                     child: Column(
-                      children: _messagesList(chat.messages),
+                      children: _messagesList(chat.messages, Provider.of<AuthProvider>(context, listen: false).user!.id),
                     ),
                   ),
                 ),
                 _MessageInput(
                     serviceId: serviceId,
-                    userId: FirebaseAuth.instance.currentUser!.uid),
+                    userId: Provider.of<AuthProvider>(context, listen: false).user!.id),
               ],
             ),
           ),
@@ -163,10 +163,10 @@ class ChatView extends StatelessWidget {
     return resultado;
   }
 
-  List<Widget> _messagesList(List<MessageEntity> messages) {
+  List<Widget> _messagesList(List<MessageEntity> messages, String currentUserId) {
     return messages
         .map(
-          (e) => e.ownerId != FirebaseAuth.instance.currentUser!.uid
+          (e) => e.ownerId != currentUserId
               ? ListTile(
                   title: Column(
                     mainAxisAlignment: MainAxisAlignment.start,

lib/ui/views/dashboard_view.dart

@@ -1,8 +1,7 @@
 import 'dart:async';
 import 'dart:convert';
-
-import 'package:cloud_firestore/cloud_firestore.dart';
 import 'package:intl/intl.dart';
+import 'package:prosapp_web_app/services/api_service.dart';
 import 'package:prosapp_web_app/models/schedules_entity.dart';
 import 'package:prosapp_web_app/models/service.dart';
 import 'package:prosapp_web_app/models/service_location_preferences.dart';
@@ -142,7 +141,7 @@ class _DashboardViewState extends State<DashboardView> {
           latitude: latitude,
           longitude: longitude,
           day: selectedDay.toString(),
-          createdAt: Timestamp.now(),
+          createdAt: DateTime.now().toIso8601String(),
           description: '',
           range1Hour1: selectedHour!,
           range1Hour2: selectedHour!.add(hour: 2),
@@ -153,9 +152,7 @@ class _DashboardViewState extends State<DashboardView> {
 
         print('debug 1');
 
-        await FirebaseFirestore.instance
-            .collection('services')
-            .add(service.toDocument());
+        await ApiService.instance.post('/services', service.toDocument());
 
         print('debug 2');
 

lib/ui/views/phone_login_view.dart

@@ -64,7 +64,7 @@ class PhoneLoginView extends StatelessWidget {
                           showDialog(
                             context: context,
                             builder: (context) =>
-                                _buildOtpModal(context, authProvider),
+                                _buildOtpModal(context, authProvider, phoneFormProvider.phone),
                           );
                         }
                       },
@@ -89,7 +89,7 @@ class PhoneLoginView extends StatelessWidget {
     );
   }
 
-  Widget _buildOtpModal(BuildContext context, AuthProvider authProvider) {
+  Widget _buildOtpModal(BuildContext context, AuthProvider authProvider, String phone) {
     final _otpController = TextEditingController();
 
     return AlertDialog(
@@ -111,7 +111,7 @@ class PhoneLoginView extends StatelessWidget {
             final otp = _otpController.text.trim();
 
             if (otp.isNotEmpty) {
-              await authProvider.signInWithOTP(otp);
+              await authProvider.signInWithOTP(phone, otp);
               Navigator.of(context).pop();
             } else {
               ScaffoldMessenger.of(context).showSnackBar(

lib/ui/views/phone_view.dart

@@ -77,7 +77,7 @@ class PhoneView extends StatelessWidget {
                                         showDialog(
                                           context: context,
                                           builder: (context) => _buildOtpModal(
-                                              context, authProvider),
+                                              context, authProvider, phoneFormProvider.phone),
                                         );
                                       }
                                     },
@@ -102,7 +102,7 @@ class PhoneView extends StatelessWidget {
     );
   }
 
-  Widget _buildOtpModal(BuildContext context, AuthProvider authProvider) {
+  Widget _buildOtpModal(BuildContext context, AuthProvider authProvider, String phone) {
     final _otpController = TextEditingController();
 
     return AlertDialog(
@@ -124,7 +124,7 @@ class PhoneView extends StatelessWidget {
             final otp = _otpController.text.trim();
 
             if (otp.isNotEmpty) {
-              await authProvider.linkPhoneWithOTP(otp);
+              await authProvider.linkPhoneWithOTP(phone, otp);
               Navigator.of(context).pop();
             } else {
               ScaffoldMessenger.of(context).showSnackBar(

lib/ui/views/rating_view.dart

@@ -1,4 +1,4 @@
-import 'package:cloud_firestore/cloud_firestore.dart';
+
 import 'package:flutter/material.dart';
 import 'package:prosapp_web_app/models/comment_entity.dart';
 import 'package:prosapp_web_app/providers/score_provider.dart';
@@ -181,7 +181,7 @@ class _RatingViewState extends State<RatingView> {
                                       score: _rating,
                                       isFromUser: true,
                                       serviceId: widget.serviceId,
-                                      createdAt: Timestamp.now(),
+                                      createdAt: DateTime.now().toIso8601String(),
                                       authorId: service.userId,
                                       destinationId: service.professionalId,
                                     );
@@ -200,7 +200,7 @@ class _RatingViewState extends State<RatingView> {
                                       score: _rating,
                                       isFromUser: false,
                                       serviceId: widget.serviceId,
-                                      createdAt: Timestamp.now(),
+                                      createdAt: DateTime.now().toIso8601String(),
                                       authorId: service.professionalId,
                                       destinationId: service.userId,
                                     );