feat: migrate prosapp_web_app from Firebase to NestJS API

- Replace Firebase Auth with JWT stored in SharedPreferences
- Replace Firestore with REST API calls via new ApiService
- Replace Firebase Storage with POST /storage/upload
- Remove firebase_auth, firebase_core, cloud_firestore,
  firebase_storage, firebase_messaging, google_sign_in deps
- Add api_service.dart as central HTTP client

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

lib/src/presentation/screens/new_number.dart

@@ -1,4 +1,3 @@
-import 'package:firebase_auth/firebase_auth.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:get/get.dart';
@@ -14,18 +13,6 @@ class NewNumberScreen extends StatefulWidget {
   State<NewNumberScreen> createState() => _NewNumberScreenState();
 }
 
-// Actualizar número de teléfono en Firebase
-Future<void> updatePhoneNumber(String verificationId, String smsCode) async {
-  try {
-    PhoneAuthCredential credential = PhoneAuthProvider.credential(
-        verificationId: verificationId, smsCode: smsCode);
-    await FirebaseAuth.instance.currentUser!.updatePhoneNumber(credential);
-    print("Phone number updated successfully");
-  } catch (e) {
-    print("Error updating phone number: $e");
-  }
-}
-
 class _NewNumberScreenState extends State<NewNumberScreen> {
   final controller = Get.put(NewPhoneController());
   String completePhoneNumber = '';
@@ -149,7 +136,7 @@ class _NewNumberScreenState extends State<NewNumberScreen> {
                               controller.updatePhoneNumber(
                                   completePhoneNumber.toString());
                             },
-                            label: 'Enviar código'),
+                            label: 'Actualizar número'),
                       ),
                     ),
                   ],
@@ -262,7 +249,7 @@ class _NewNumberScreenState extends State<NewNumberScreen> {
                                 controller.updatePhoneNumber(
                                     completePhoneNumber.toString());
                               },
-                              label: 'Enviar código'),
+                              label: 'Actualizar número'),
                         ),
                       ),
                     ],