v2.40 — Issue #9: Progress-Notification für Download/Upload (flutter_local_notifications)

- flutter_local_notifications ^22.2.0 hinzugefügt
- Notification-Channel 'de.baka.melo.downloads' in main() initialisiert
- DownloadService._showProgress(): Fortschritts-Notification mit ProgressBar
- DownloadService._completeNotification(): Abschluss-Notification (Erfolg/Fehler/Abbruch)
- Integration in downloadBatch(): Fortschritt pro Song, Abschluss nach Batch
- CloudScreen._upload(): Upload-Fortschritt + Abschluss-Notification

lib/main.dart

@@ -4,6 +4,7 @@ import 'dart:io' show Platform;
 import 'package:audio_service/audio_service.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:permission_handler/permission_handler.dart';
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
 import 'database/db_helper.dart';
 import 'services/favoriten_service.dart';
 import 'services/auth_service.dart';
@@ -15,12 +16,37 @@ import 'utils/farb_theme.dart';
 import 'screens/home_screen.dart';
 import 'screens/login_screen.dart';
 
+/// Globaler Notification-Plugin (wird in main() initialisiert)
+final FlutterLocalNotificationsPlugin notificationsPlugin =
+    FlutterLocalNotificationsPlugin();
+
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
 
   // Logger startet sofort – zeichnet ALLES auf
   MeloLogger().init('2.35');
 
+  // ── Notifications initialisieren (Issue #9) ──
+  const androidInit = AndroidInitializationSettings('@mipmap/ic_launcher');
+  const initSettings = InitializationSettings(android: androidInit);
+  await notificationsPlugin.initialize(
+    settings: initSettings,
+  );
+
+  // Notification-Channel für Downloads (Fortschritt + Abschluss)
+  const downloadChannel = AndroidNotificationChannel(
+    'de.baka.melo.downloads',
+    'Melo Downloads',
+    description: 'Download-Fortschritt und Abschluss',
+    importance: Importance.low,
+    playSound: false,
+    enableVibration: false,
+  );
+  await notificationsPlugin
+      .resolvePlatformSpecificImplementation<
+          AndroidFlutterLocalNotificationsPlugin>()
+      ?.createNotificationChannel(downloadChannel);
+
   try {
     await DbHelper().db;
     await FavoritenService().init();