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>

pubspec.yaml

@@ -37,23 +37,22 @@ dependencies:
   cupertino_icons: ^1.0.2
   location: ^5.0.3
   flutter_polyline_points: ^2.0.0
-  google_maps_flutter: ^2.5.0
+  google_maps_flutter: ^2.9.0
   file_picker: ^5.3.2
   provider: ^6.0.5
   package_info_plus: ^4.2.0
-  get:
-  font_awesome_flutter: ^10.4.0
+  font_awesome_flutter: ^10.8.0
   flutter_otp_text_field:
   intl_phone_field:
   diacritic:
-  image_picker: ^1.0.4
+  image_picker: ^1.1.2
   flutter_animate:
   flutter_rating_bar:
   table_calendar:
   http: ^1.1.0
   geolocator: ^9.0.2
   geocoding: ^2.1.0
-  url_launcher: ^6.1.10
+  url_launcher: ^6.3.0
   community_material_icon: ^5.9.55
   webview_flutter: ^4.4.1
   responsive_builder: ^0.7.0