feat: move Amazon Music to extension, fix Deezer download timeout

lib/widgets/donate_icons.dart

@@ -28,14 +28,12 @@ class _KofiPainter extends CustomPainter {
       ..color = color
       ..style = PaintingStyle.fill;
 
-    // Cup body
     final cup = RRect.fromRectAndRadius(
       Rect.fromLTWH(s * 0.08, s * 0.28, s * 0.62, s * 0.52),
       Radius.circular(s * 0.12),
     );
     canvas.drawRRect(cup, paint);
 
-    // Handle
     final handlePaint = Paint()
       ..color = color
       ..style = PaintingStyle.stroke

lib/widgets/download_service_picker.dart

@@ -67,17 +67,6 @@ const _builtInServices = [
       ),
     ],
   ),
-  BuiltInService(
-    id: 'amazon',
-    label: 'Amazon',
-    qualityOptions: [
-      QualityOption(
-        id: 'LOSSLESS',
-        label: 'FLAC Best Available',
-        description: 'Amazon API delivers the best available lossless quality',
-      ),
-    ],
-  ),
   BuiltInService(
     id: 'deezer',
     label: 'Deezer',
@@ -209,7 +198,6 @@ class _DownloadServicePickerState extends ConsumerState<DownloadServicePicker> {
       return ext.qualityOptions;
     }
 
-    // Default fallback options
     return [
       const QualityOption(
         id: 'DEFAULT',