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/providers/professional_form_provider.dart

@@ -1,18 +1,17 @@
 import 'dart:typed_data';
-
-import 'package:cloud_firestore/cloud_firestore.dart';
-import 'package:firebase_storage/firebase_storage.dart';
 import 'package:flutter/material.dart';
 import 'package:prosapp_web_app/models/location_preferences.dart';
 import 'package:prosapp_web_app/models/payment_method_entity.dart';
 import 'package:prosapp_web_app/models/profesional.dart';
 import 'package:prosapp_web_app/models/schedules.dart';
+import 'package:prosapp_web_app/services/api_service.dart';
 import 'package:prosapp_web_app/services/notifications_service.dart';
 
 class ProfessionalFormProvider with ChangeNotifier {
   Profesional? profesional;
   GlobalKey<FormState> formKey = GlobalKey<FormState>();
   GlobalKey<FormState> profileFormKey = GlobalKey<FormState>();
+  final _api = ApiService.instance;
 
   copyProfesionalWith({
     String? id,
@@ -41,160 +40,70 @@ class ProfessionalFormProvider with ChangeNotifier {
       profession: profession ?? profesional!.profession,
       ratePreferences: ratePreferences,
       rate: rate ?? profesional!.rate,
-      locationPreferences:
-          locationPreferences ?? profesional!.locationPreferences,
+      locationPreferences: locationPreferences ?? profesional!.locationPreferences,
       bannerPicture: bannerPicture ?? profesional!.bannerPicture,
-      identificationPicture:
-          identificationPicture ?? profesional!.identificationPicture,
+      identificationPicture: identificationPicture ?? profesional!.identificationPicture,
       certificatePicture: certificatePicture ?? profesional!.certificatePicture,
       latitude: latitude ?? profesional!.latitude,
       longitude: longitude ?? profesional!.longitude,
       specializations: specializations ?? profesional!.specializations,
-      specializationsPictures:
-          specializationsPictures ?? profesional!.specializationsPictures,
+      specializationsPictures: specializationsPictures ?? profesional!.specializationsPictures,
       schedules: schedules ?? profesional!.schedules,
       paymentMethods: paymentMethods ?? profesional!.paymentMethods,
     );
-
     notifyListeners();
   }
 
-  bool _validForm() {
-    return formKey.currentState!.validate();
-  }
+  bool _validForm() => formKey.currentState!.validate();
+  bool _validProfileForm() => profileFormKey.currentState!.validate();
 
-  bool _validProfileForm() {
-    return profileFormKey.currentState!.validate();
-  }
-
-  setProfesional(Profesional profesional) {
-    this.profesional = profesional;
+  setProfesional(Profesional p) {
+    profesional = p;
     notifyListeners();
   }
 
   Future<bool> updateProfesionalInfo(String userId) async {
     if (!_validForm()) return false;
-
-    final docProfessional = FirebaseFirestore.instance
-        .collection('professional_info')
-        .doc(userId)
-        .withConverter(
-          fromFirestore: (snapshot, _) =>
-              Profesional.fromDocument(snapshot.data()!),
-          toFirestore: (user, _) => user.toDocument(),
-        );
-
-    await docProfessional.set(profesional!);
-
+    await _api.patch('/professional-info/$userId', profesional!.toDocument());
     NotificationsService.showSnackbar('Información actualizada');
-
     return true;
   }
 
   Future<bool> updateProfesionalProfileInfo(String userId) async {
     if (!_validProfileForm()) return false;
-
-    final docProfessional = FirebaseFirestore.instance
-        .collection('professional_info')
-        .doc(userId)
-        .withConverter(
-          fromFirestore: (snapshot, _) =>
-              Profesional.fromDocument(snapshot.data()!),
-          toFirestore: (user, _) => user.toDocument(),
-        );
-
-    await docProfessional.set(profesional!);
-
+    await _api.patch('/professional-info/$userId', profesional!.toDocument());
     NotificationsService.showSnackbar('Información actualizada');
-
     return true;
   }
 
   Future<bool> updateProfesionalProfileScheduleInfo(String userId) async {
-    final docProfessional = FirebaseFirestore.instance
-        .collection('professional_info')
-        .doc(userId)
-        .withConverter(
-          fromFirestore: (snapshot, _) =>
-              Profesional.fromDocument(snapshot.data()!),
-          toFirestore: (user, _) => user.toDocument(),
-        );
-
-    await docProfessional.set(profesional!);
-
+    await _api.patch('/professional-info/$userId', profesional!.toDocument());
     NotificationsService.showSnackbar('Información actualizada');
-
     return true;
   }
 
-  Future<Profesional> uploadPdfIdentification(
-      Uint8List fileBytes, String userId) async {
-    try {
-      final storageRef = FirebaseStorage.instance
-          .ref()
-          .child('$userId/PDF/${userId}_cedula.pdf');
-
-      await storageRef.putData(fileBytes);
-      final url = await storageRef.getDownloadURL();
-
-      copyProfesionalWith(identificationPicture: url);
-
-      notifyListeners();
-
-      return profesional!;
-    } catch (e) {
-      print("Error al subir el PDF de identificación: $e");
-      NotificationsService.showSnackbar('Error al subir el PDF');
-      rethrow;
-    }
+  Future<Profesional> uploadPdfIdentification(Uint8List fileBytes, String userId) async {
+    final url = await _api.upload(fileBytes, '${userId}_cedula.pdf');
+    if (url != null) copyProfesionalWith(identificationPicture: url);
+    notifyListeners();
+    return profesional!;
   }
 
-  Future<Profesional> uploadPdfCertificate(
-      Uint8List fileBytes, String userId) async {
-    try {
-      final storageRef = FirebaseStorage.instance
-          .ref()
-          .child('$userId/PDF/${userId}_certificado.pdf');
-
-      await storageRef.putData(fileBytes);
-      final url = await storageRef.getDownloadURL();
-
-      copyProfesionalWith(certificatePicture: url);
-
-      notifyListeners();
-
-      return profesional!;
-    } catch (e) {
-      print("Error al subir el PDF de identificación: $e");
-      NotificationsService.showSnackbar('Error al subir el PDF');
-      rethrow;
-    }
+  Future<Profesional> uploadPdfCertificate(Uint8List fileBytes, String userId) async {
+    final url = await _api.upload(fileBytes, '${userId}_certificado.pdf');
+    if (url != null) copyProfesionalWith(certificatePicture: url);
+    notifyListeners();
+    return profesional!;
   }
 
-  Future<Profesional> uploadPdfSpecializations(
-      List<Uint8List> filesBytes, String userId) async {
-    try {
-      List<String> urls = [];
-
-      for (int i = 0; i < filesBytes.length; i++) {
-        final storageRef = FirebaseStorage.instance.ref().child(
-            '$userId/PDF/${userId}_${DateTime.now().millisecondsSinceEpoch}_especializacion_$i.pdf');
-
-        await storageRef.putData(filesBytes[i]);
-
-        final url = await storageRef.getDownloadURL();
-        urls.add(url);
-      }
-
-      copyProfesionalWith(specializationsPictures: urls);
-
-      notifyListeners();
-
-      return profesional!;
-    } catch (e) {
-      print("Error al subir los PDFs de especialización: $e");
-      NotificationsService.showSnackbar('Error al subir los PDFs');
-      rethrow;
+  Future<Profesional> uploadPdfSpecializations(List<Uint8List> filesBytes, String userId) async {
+    List<String> urls = [];
+    for (int i = 0; i < filesBytes.length; i++) {
+      final url = await _api.upload(filesBytes[i], '${userId}_especializacion_$i.pdf');
+      if (url != null) urls.add(url);
     }
+    copyProfesionalWith(specializationsPictures: urls);
+    notifyListeners();
+    return profesional!;
   }
 }