Fix mobile app submodule initialization and cleanup

- Removed incorrect swingmusic_mobile directory
- Properly initialized swingmusic_mobile submodule from swingmusic-mobile.git
- Clean submodule configuration for unified release workflow

swingmusic_mobile/lib/data/models/search_suggestion_model.dart

@@ -1,15 +0,0 @@
-class SearchSuggestion {
-  final String id;
-  final String title;
-  final String? imageUrl;
-  final String type; // 'track', 'album', 'artist', 'playlist'
-  final dynamic data;
-
-  SearchSuggestion({
-    required this.id,
-    required this.title,
-    this.imageUrl,
-    required this.type,
-    this.data,
-  });
-}