refactor: Projektstruktur in app/ und backend/ aufgeteilt

app/lib/main.dart

@@ -0,0 +1,122 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+import 'login_view.dart';
+import 'jobs_view.dart';
+import 'cargo_items_view.dart';
+import 'chats_view.dart';
+import 'chat_details_view.dart';
+import 'settings_view.dart';
+import 'models/job.dart';
+import 'models/chat.dart';
+import 'services/database_service.dart';
+import 'services/chat_service.dart';
+import 'app_state.dart';
+import 'navigation_observer.dart';
+import 'services/notification_service.dart';
+import 'l10n/app_localizations.dart';
+
+void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+
+  // Initialize SQLite database
+  await DatabaseService().initialize();
+
+  // Load data from database
+  await AppState().loadLoginFromDatabase();
+
+  // Load language preference
+  await AppState().loadLanguagePreference();
+
+  // Load jobs from database to trigger message type logging at startup
+  await AppState().refreshJobsFromDatabase();
+
+  // Prepare chat service before WebSocket events start flowing
+  await ChatService().initialize();
+
+  // Initialize notification service for local notifications with sound
+  await NotificationService().initialize();
+
+  // Note: WebSocket connection is initiated from the view that needs it:
+  // - If userId exists: JobsView initiates connection on startup
+  // - If no userId: LoginView initiates connection when login button is clicked
+
+  runApp(const MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    // Check if user is already logged in
+    final appState = AppState();
+    final initialRoute = appState.isLoggedIn ? '/jobs' : '/login';
+
+    return ValueListenableBuilder<Locale>(
+      valueListenable: localeNotifier,
+      builder: (context, locale, child) {
+        return MaterialApp(
+          title: 'VotianLT App',
+          debugShowCheckedModeBanner: false,
+          theme: ThemeData(colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple), useMaterial3: true),
+          // Localization configuration
+          locale: locale,
+          localizationsDelegates: const [AppLocalizations.delegate, GlobalMaterialLocalizations.delegate, GlobalWidgetsLocalizations.delegate, GlobalCupertinoLocalizations.delegate],
+          supportedLocales: supportedLanguageCodes.map((code) => Locale(code)).toList(),
+          navigatorObservers: [routeObserver],
+          initialRoute: initialRoute,
+          onGenerateRoute: (settings) {
+            switch (settings.name) {
+              case '/login':
+                final arg = settings.arguments;
+                final suppress = (arg is bool) ? arg : false;
+                return MaterialPageRoute(builder: (_) => LoginView(suppressConnectionSnack: suppress));
+              case '/jobs':
+                return MaterialPageRoute(builder: (_) => const JobsView());
+              case '/cargo_items':
+                final job = settings.arguments as Job;
+                return MaterialPageRoute(builder: (_) => CargoItemsView(job: job));
+              case '/chats':
+                return MaterialPageRoute(builder: (_) => const ChatsView());
+              case '/chat_details':
+                final chat = settings.arguments as Chat;
+                return MaterialPageRoute(builder: (_) => ChatDetailsView(chat: chat));
+              case '/settings':
+                return MaterialPageRoute(builder: (_) => const SettingsView());
+              default:
+                return MaterialPageRoute(builder: (_) => const LoginView(suppressConnectionSnack: false));
+            }
+          },
+        );
+      },
+    );
+  }
+}
+
+class MyHomePage extends StatefulWidget {
+  const MyHomePage({super.key, required this.title});
+
+  final String title;
+
+  @override
+  State<MyHomePage> createState() => _MyHomePageState();
+}
+
+class _MyHomePageState extends State<MyHomePage> {
+  int _counter = 0;
+
+  void _incrementCounter() {
+    setState(() {
+      _counter++;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(backgroundColor: Theme.of(context).colorScheme.inversePrimary, title: Text(widget.title)),
+      body: Center(child: Column(mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[const Text('You have pushed the button this many times:'), Text('$_counter', style: Theme.of(context).textTheme.headlineMedium)])),
+      floatingActionButton: FloatingActionButton(onPressed: _incrementCounter, tooltip: 'Increment', child: const Icon(Icons.add)), // This trailing comma makes auto-formatting nicer for build methods.
+    );
+  }
+}