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/models/comment_entity.dart

@@ -1,5 +1,3 @@
-import 'package:cloud_firestore/cloud_firestore.dart';
-
 class CommentEntity {
   final String authorId;
   final String destinationId;
@@ -7,7 +5,7 @@ class CommentEntity {
   final String content;
   final double score;
   final bool isFromUser;
-  final Timestamp createdAt;
+  final String createdAt;
 
   const CommentEntity({
     required this.authorId,
@@ -21,13 +19,13 @@ class CommentEntity {
 
   static CommentEntity fromDocument(Map<String, dynamic> doc) {
     return CommentEntity(
-      authorId: doc['author_id'] as String,
-      destinationId: doc['destination_id'] as String,
-      serviceId: doc['service_id'] as String,
-      content: doc['content'] as String,
-      score: doc['score'] as double,
-      isFromUser: doc['is_from_user'] as bool,
-      createdAt: doc['created_at'] as Timestamp,
+      authorId: doc['author_id'] as String? ?? '',
+      destinationId: doc['destination_id'] as String? ?? '',
+      serviceId: doc['service_id'] as String? ?? '',
+      content: doc['content'] as String? ?? '',
+      score: (doc['score'] as num?)?.toDouble() ?? 0.0,
+      isFromUser: doc['is_from_user'] as bool? ?? false,
+      createdAt: doc['created_at']?.toString() ?? '',
     );
   }
 
@@ -45,14 +43,6 @@ class CommentEntity {
 
   @override
   String toString() {
-    return '''CommentEntity{
-      authorId: $authorId, 
-      destinationId: $destinationId, 
-      serviceId: $serviceId, 
-      content: $content, 
-      score: $score, 
-      isFromUser: $isFromUser, 
-      createdAt: $createdAt
-      }''';
+    return 'CommentEntity{authorId: $authorId, destinationId: $destinationId, score: $score}';
   }
 }

lib/models/service.dart

@@ -1,4 +1,3 @@
-import 'package:cloud_firestore/cloud_firestore.dart';
 import 'package:flutter/material.dart';
 import 'package:prosapp_web_app/models/service_location_preferences.dart';
 import 'package:prosapp_web_app/models/service_status.dart';
@@ -14,7 +13,7 @@ class Service {
   final double latitude;
   final double longitude;
   final String day;
-  final Timestamp createdAt;
+  final String createdAt;
   final String description;
   final TimeOfDay range1Hour1;
   final TimeOfDay range1Hour2;
@@ -46,28 +45,24 @@ class Service {
     return Service(
       id: id,
       professionalId: doc['professional_id'] as String,
-      professionalScored: doc['professional_scored'] as bool,
+      professionalScored: doc['professional_scored'] as bool? ?? false,
       userId: doc['user_id'] as String,
-      userScored: doc['user_scored'] as bool,
-      address: doc['address'] as String,
-      aditionalAddress: doc['aditional_address'] as String,
-      latitude: doc['latitude'] as double,
-      longitude: doc['longitude'] as double,
-      day: doc['day'] as String,
-      createdAt: doc['created_at'] as Timestamp,
-      description: doc['description'] as String,
-      range1Hour1: parseTimeOfDay(doc['range1_hour1'] as String),
-      range1Hour2: parseTimeOfDay(doc['range1_hour2'] as String),
-      status: intToEnumService(doc['status'] as int),
-      rate: doc['rate'] as String,
-      location: intToEnum(doc['location'] as int),
+      userScored: doc['user_scored'] as bool? ?? false,
+      address: doc['address'] as String? ?? '',
+      aditionalAddress: doc['aditional_address'] as String? ?? '',
+      latitude: (doc['latitude'] as num?)?.toDouble() ?? 0.0,
+      longitude: (doc['longitude'] as num?)?.toDouble() ?? 0.0,
+      day: doc['day'] as String? ?? '',
+      createdAt: doc['created_at']?.toString() ?? '',
+      description: doc['description'] as String? ?? '',
+      range1Hour1: parseTimeOfDay(doc['range1_hour1'] as String? ?? '0:0'),
+      range1Hour2: parseTimeOfDay(doc['range1_hour2'] as String? ?? '0:0'),
+      status: intToEnumService((doc['status'] as num?)?.toInt() ?? 0),
+      rate: doc['rate'] as String? ?? '',
+      location: intToEnum((doc['location'] as num?)?.toInt() ?? 0),
     );
   }
 
-  static Service fromDocument(DocumentSnapshot<Map<String, dynamic>> doc) {
-    return fromJson(doc.data()!, doc.id);
-  }
-
   Map<String, dynamic> toDocument() {
     return {
       'id': id,
@@ -96,21 +91,12 @@ class Service {
   }
 
   String? formatTimeOfDay(TimeOfDay? time) {
-    if (time != null) {
-      return "${time.hour.toString()}:${time.minute.toString()}";
-    }
+    if (time != null) return '${time.hour}:${time.minute}';
     return null;
   }
 
   @override
   String toString() {
-    return '''Service {
-      professionalId: $professionalId,
-      userId: $userId,
-      day: $day,
-      createdAt: $createdAt,
-      status: $status,
-      location: $location
-    }''';
+    return 'Service{professionalId: $professionalId, userId: $userId, day: $day, status: $status}';
   }
 }

lib/models/usuario_profesional.dart

@@ -21,12 +21,19 @@ class UsuarioProfesional {
     };
   }
 
-  // Método para deserializar desde JSON
   factory UsuarioProfesional.fromJson(Map<String, dynamic> json) {
     return UsuarioProfesional(
       user: Usuario.fromDocument(json['user']),
       professionalInfo: Profesional.fromDocument(json['professionalInfo']),
-      averageScore: json['averageScore'].toDouble(),
+      averageScore: (json['averageScore'] as num?)?.toDouble() ?? 0.0,
+    );
+  }
+
+  static UsuarioProfesional fromDocument(Map<String, dynamic> doc) {
+    return UsuarioProfesional(
+      user: Usuario.fromDocument(doc['user'] as Map<String, dynamic>),
+      professionalInfo: Profesional.fromDocument(doc['professional_info'] as Map<String, dynamic>),
+      averageScore: (doc['average_score'] as num?)?.toDouble() ?? 0.0,
     );
   }