feat: Refactor code structure and optimize performance across multiple modules

mobile-apps/client-app/lib/main.dart

@@ -0,0 +1,19 @@
+import 'package:firebase_core/firebase_core.dart';
+import 'package:flutter/material.dart';
+import 'package:graphql_flutter/graphql_flutter.dart';
+import 'package:injectable/injectable.dart';
+import 'package:krow/app.dart';
+import 'package:flutter_dotenv/flutter_dotenv.dart';
+import 'core/application/di/injectable.dart';
+
+void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+  await dotenv.load(fileName: '.env');
+
+  await Firebase.initializeApp();
+  await initHiveForFlutter();
+
+  configureDependencies(Environment.prod);
+
+  runApp(const KrowApp());
+}