fix: remove get package, upgrade Flutter 3.44 compat deps

- Remove `get` package (incompatible with Flutter 3.44/Dart 3.12 due to
  removed ThemeData.backgroundColor and final IconData class)
- Replace GetMaterialApp → MaterialApp with GlobalKey navigatorKey
- Convert AuthenticationRepository and all 7 controllers from
  GetxController to plain singletons
- Replace Get.snackbar/offAll/to/back/defaultDialog with app_navigator
  helpers and native Flutter APIs
- Add ApiService.baseUrl static + parseJson method
- Add UserModel.getUser static method
- Add UserProvider.score via ScoresModel API
- Fix user?.photo → user?.picture in drawer_menu, service_after
- Fix logout(uid!) → logout() in drawer_menu
- Fix photo_view_web.dart missing dart:typed_data import
- Remove getCoordsOfCity call from ubicacion.dart
- Fix UserModel.getUser?.name null-safety in map/service.dart
- Upgrade: google_maps_flutter ^2.9.0, url_launcher ^6.3.0,
  font_awesome_flutter ^10.8.0, image_picker ^1.1.2

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

lib/src/controllers/new_phone_controller.dart

@@ -1,25 +1,20 @@
 import 'package:flutter/material.dart';
-import 'package:get/get.dart';
 import 'package:prosappco/src/services/api_service.dart';
+import 'package:prosappco/src/utils/app_navigator.dart';
+
+class NewPhoneController {
+  static final instance = NewPhoneController();
 
-class NewPhoneController extends GetxController {
   final newPhoneNo = TextEditingController(text: '');
   final otpCode = TextEditingController(text: '');
 
   Future<void> updatePhoneNumber(String newPhone) async {
     try {
       await ApiService.instance.patch('/users/me', {'phone': newPhone});
-      Get.snackbar(
-        'Número de teléfono actualizado',
-        'El número de teléfono se ha actualizado correctamente.',
-        snackPosition: SnackPosition.BOTTOM,
-      );
+      showAppSnackBar('Número actualizado', 'El número de teléfono se actualizó correctamente.',
+          color: const Color(0xFF2BA4EC));
     } catch (e) {
-      Get.snackbar(
-        'Error al actualizar',
-        'No se pudo actualizar el número de teléfono: $e',
-        snackPosition: SnackPosition.BOTTOM,
-      );
+      showAppSnackBar('Error al actualizar', 'No se pudo actualizar el número: $e');
     }
   }
 }