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/presentation/widgets/shared/notificacion_snackbar.dart

@@ -1,51 +1,14 @@
 import 'package:flutter/material.dart';
-import 'package:get/get.dart';
+import 'package:prosappco/src/utils/app_navigator.dart';
 
 class NotificationSnackbar {
   static void show({
     required String title,
     required String message,
-    SnackPosition position = SnackPosition.TOP,
-    Duration duration = const Duration(seconds: 4),
     Color backgroundColor = Colors.red,
     Color textColor = Colors.white,
-    double borderRadius = 10.0,
-    EdgeInsets margin = const EdgeInsets.all(10.0),
-    SnackStyle snackStyle = SnackStyle.FLOATING,
-    Duration animationDuration = const Duration(milliseconds: 800),
-    bool isDismissible = true,
-    DismissDirection dismissDirection = DismissDirection.horizontal,
-    Curve forwardAnimationCurve = Curves.easeOutBack,
-    Curve reverseAnimationCurve = Curves.easeInBack,
     Icon icon = const Icon(Icons.warning, color: Colors.white),
-    bool shouldIconPulse = true,
   }) {
-    Get.snackbar(
-      title,
-      message,
-      snackPosition: position,
-      duration: duration,
-      backgroundColor: backgroundColor,
-      colorText: textColor,
-      borderRadius: borderRadius,
-      margin: margin,
-      snackStyle: snackStyle,
-      animationDuration: animationDuration,
-      isDismissible: isDismissible,
-      dismissDirection: dismissDirection,
-      forwardAnimationCurve: forwardAnimationCurve,
-      reverseAnimationCurve: reverseAnimationCurve,
-      icon: icon,
-      shouldIconPulse: shouldIconPulse,
-      titleText: Text(
-        title,
-        style: const TextStyle(
-            fontSize: 18.0, fontWeight: FontWeight.bold, color: Colors.white),
-      ),
-      messageText: Text(
-        message,
-        style: const TextStyle(fontSize: 16.0, color: Colors.white),
-      ),
-    );
+    showAppSnackBar(title, message, color: backgroundColor);
   }
 }