feat: add 5 new lyrics providers

New lyrics providers using Paxsenix API:
- Spotify: Synced lyrics from Spotify
- Deezer: Synced lyrics from Deezer
- YouTube: Lyrics from YouTube
- Kugou: Lyrics from Kugou (Chinese service)
- Genius: Plain text lyrics from Genius

Implementation:
- Add lyrics client implementations for all providers
- Smart search result scoring based on track name, artist, and duration
- Support for both synced (LRC) and unsynced lyrics formats
- Fallback search with simplified track names and primary artist

UI updates:
- Add provider entries to lyrics priority settings page
- Add display names for new providers in settings

lib/l10n/app_localizations.dart

@@ -837,7 +837,7 @@ abstract class AppLocalizations {
   /// App description in header card
   ///
   /// In en, this message translates to:
-  /// **'Download Spotify tracks in lossless quality from Tidal and Qobuz.'**
+  /// **'Search music metadata, manage extensions, and organize your library.'**
   String get aboutAppDescription;
 
   /// Section header for artist albums

lib/l10n/app_localizations_de.dart

@@ -405,7 +405,7 @@ class AppLocalizationsDe extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Lade Spotify-Titel in verlustfreier Qualität von Tidal und Qobuz herunter.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Alben';

lib/l10n/app_localizations_en.dart

@@ -397,7 +397,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';

lib/l10n/app_localizations_es.dart

@@ -397,7 +397,7 @@ class AppLocalizationsEs extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';
@@ -4585,7 +4585,7 @@ class AppLocalizationsEsEs extends AppLocalizationsEs {
 
   @override
   String get aboutAppDescription =>
-      'Descargar pistas de Spotify en alta calidad (sin pérdida) de Tidal y Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Álbumes';

lib/l10n/app_localizations_fr.dart

@@ -399,7 +399,7 @@ class AppLocalizationsFr extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';

lib/l10n/app_localizations_hi.dart

@@ -397,7 +397,7 @@ class AppLocalizationsHi extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';

lib/l10n/app_localizations_id.dart

@@ -400,7 +400,7 @@ class AppLocalizationsId extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Unduh lagu-lagu Spotify dalam kualitas lossless dari Tidal dan Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Album';

lib/l10n/app_localizations_ja.dart

@@ -393,7 +393,7 @@ class AppLocalizationsJa extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'アルバム';

lib/l10n/app_localizations_ko.dart

@@ -385,7 +385,7 @@ class AppLocalizationsKo extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => '앨범';

lib/l10n/app_localizations_nl.dart

@@ -397,7 +397,7 @@ class AppLocalizationsNl extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';

lib/l10n/app_localizations_pt.dart

@@ -397,7 +397,7 @@ class AppLocalizationsPt extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';
@@ -4584,7 +4584,7 @@ class AppLocalizationsPtPt extends AppLocalizationsPt {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Álbuns';

lib/l10n/app_localizations_ru.dart

@@ -403,7 +403,7 @@ class AppLocalizationsRu extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Скачивайте треки Spotify в lossless качестве с Tidal и Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Альбомы';

lib/l10n/app_localizations_tr.dart

@@ -405,7 +405,7 @@ class AppLocalizationsTr extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Spotify parçalarını Tidal ve Qobuz aracılığıyla kayıpsız kalitede indirin.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albümler';

lib/l10n/app_localizations_uk.dart

@@ -407,7 +407,7 @@ class AppLocalizationsUk extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Кінцеві точки потокового передавання Tidal Hi-Res FLAC. Ключовий елемент пазлу музики без втрат.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Альбоми';

lib/l10n/app_localizations_zh.dart

@@ -397,7 +397,7 @@ class AppLocalizationsZh extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';
@@ -4565,7 +4565,7 @@ class AppLocalizationsZhCn extends AppLocalizationsZh {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';
@@ -8046,7 +8046,7 @@ class AppLocalizationsZhTw extends AppLocalizationsZh {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';

lib/l10n/arb/app_de.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Lade Spotify-Titel in verlustfreier Qualität von Tidal und Qobuz herunter.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_en.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_es.arb

@@ -398,7 +398,7 @@
   "@aboutSachinsenalDesc": {
     "description": "Credit description for sachinsenal0x64"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_es_ES.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Descargar pistas de Spotify en alta calidad (sin pérdida) de Tidal y Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_fr.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_hi.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_id.arb

@@ -458,7 +458,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Unduh lagu-lagu Spotify dalam kualitas lossless dari Tidal dan Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_ja.arb

@@ -438,7 +438,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_ko.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_nl.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_pt.arb

@@ -398,7 +398,7 @@
   "@aboutSachinsenalDesc": {
     "description": "Credit description for sachinsenal0x64"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_pt_PT.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_ru.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Скачивайте треки Spotify в lossless качестве с Tidal и Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_tr.arb

@@ -438,7 +438,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Spotify parçalarını Tidal ve Qobuz aracılığıyla kayıpsız kalitede indirin.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_uk.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Кінцеві точки потокового передавання Tidal Hi-Res FLAC. Ключовий елемент пазлу музики без втрат.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_zh.arb

@@ -398,7 +398,7 @@
   "@aboutSachinsenalDesc": {
     "description": "Credit description for sachinsenal0x64"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_zh_CN.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/l10n/arb/app_zh_TW.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },

lib/screens/settings/about_page.dart

@@ -141,7 +141,8 @@ class AboutPage extends StatelessWidget {
                     icon: Icons.lyrics_outlined,
                     title: 'Paxsenix',
                     subtitle:
-                        'Partner lyrics proxy for Apple Music and QQ Music sources',
+                        'Lyrics proxy for Musixmatch, Netease, Apple Music, '
+                        'QQ Music, Spotify, Deezer, YouTube, Kugou, and Genius',
                     onTap: () => _launchUrl('https://lyrics.paxsenix.org'),
                     showDivider: false,
                   ),

lib/screens/settings/lyrics_provider_priority_page.dart

@@ -21,6 +21,11 @@ class _LyricsProviderPriorityPageState
     'musixmatch',
     'apple_music',
     'qqmusic',
+    'spotify',
+    'deezer',
+    'youtube',
+    'kugou',
+    'genius',
   ];
 
   late List<String> _enabledProviders;
@@ -211,6 +216,36 @@ class _LyricsProviderPriorityPageState
           description: context.l10n.lyricsProviderQqMusicDesc,
           icon: Icons.queue_music,
         );
+      case 'spotify':
+        return _LyricsProviderInfo(
+          name: 'Spotify',
+          description: context.l10n.lyricsProviderExtensionDesc,
+          icon: Icons.graphic_eq,
+        );
+      case 'deezer':
+        return _LyricsProviderInfo(
+          name: 'Deezer',
+          description: context.l10n.lyricsProviderExtensionDesc,
+          icon: Icons.album_outlined,
+        );
+      case 'youtube':
+        return _LyricsProviderInfo(
+          name: 'YouTube',
+          description: context.l10n.lyricsProviderExtensionDesc,
+          icon: Icons.smart_display_outlined,
+        );
+      case 'kugou':
+        return _LyricsProviderInfo(
+          name: 'Kugou',
+          description: context.l10n.lyricsProviderExtensionDesc,
+          icon: Icons.library_music_outlined,
+        );
+      case 'genius':
+        return _LyricsProviderInfo(
+          name: 'Genius',
+          description: context.l10n.lyricsProviderExtensionDesc,
+          icon: Icons.auto_awesome_outlined,
+        );
       default:
         return _LyricsProviderInfo(
           name: id,

lib/screens/settings/lyrics_settings_page.dart

@@ -216,6 +216,11 @@ class LyricsSettingsPage extends ConsumerWidget {
     'musixmatch': 'Musixmatch',
     'apple_music': 'Apple Music',
     'qqmusic': 'QQ Music',
+    'spotify': 'Spotify',
+    'deezer': 'Deezer',
+    'youtube': 'YouTube',
+    'kugou': 'Kugou',
+    'genius': 'Genius',
   };
 
   String _getLyricsProvidersSubtitle(