refactor(player): port tests to musicPlayerRuntime and delete the test-only wrappers

The wrappers only forwarded to musicPlayerRuntime and were referenced by one
test file. The forwarding helpers now live in that test.

lib/services/music_player_autoplay.dart

@@ -22,14 +22,6 @@ AutoplayLearningTrack _learningTrack(PlayableMedia media) =>
       duration: media.duration,
     );
 
-void setAutoplayEnabled(bool enabled, {bool includeLocal = true}) =>
-    musicPlayerRuntime.configure(
-      musicPlayerRuntime.settings.copyWith(
-        autoplay: enabled,
-        localLibraryEnabled: includeLocal,
-      ),
-    );
-
 /// Bounded database pages keep recommendation work independent of Library
 /// size. Both downloaded tracks and enabled scanned sources are local files.
 Future<List<PlayableMedia>> _loadAutoplayLibrary(

lib/services/music_player_service.dart

@@ -30,7 +30,6 @@ import 'package:spotiflac_android/services/music_playback_deck.dart';
 import 'package:spotiflac_android/services/automix_analysis.dart';
 import 'package:spotiflac_android/services/autoplay_personalization.dart';
 import 'package:spotiflac_android/services/automix_analyzer.dart';
-import 'package:spotiflac_android/models/automix_options.dart';
 import 'package:spotiflac_android/models/settings.dart';
 import 'package:spotiflac_android/services/automix_effect_renderer.dart';
 import 'package:spotiflac_android/services/automix_status.dart';
@@ -50,50 +49,11 @@ part 'music_player_autoplay.dart';
 
 final _log = AppLogger('MusicPlayer');
 
-void configurePlaybackNotification({
-  required PlaybackNotification presentation,
-  required Future<bool> Function(MediaItem) toggleFavorite,
-}) => musicPlayerRuntime.configureNotification(
-  presentation: presentation,
-  toggleFavorite: toggleFavorite,
-);
-
 /// Muted artwork shares the music session. Recover its Now Playing ownership
 /// after video initialization, including failed or abandoned initialization.
 Future<void> restoreMusicAudioSessionAfterVideo() async =>
     musicPlayerRuntime.handler?.restoreIosNowPlaying();
 
-void setPlaybackAutomationOptions({
-  required bool enabled,
-  required bool pauseOnMute,
-  required bool playOnHeadphonesConnected,
-}) => musicPlayerRuntime.configure(
-  musicPlayerRuntime.settings.copyWith(
-    playerMode: enabled ? 'internal' : 'external',
-    pauseOnMute: pauseOnMute,
-    playOnHeadphonesConnected: playOnHeadphonesConnected,
-  ),
-);
-
-void setAutoMixEnabled(bool enabled) => musicPlayerRuntime.configure(
-  musicPlayerRuntime.settings.copyWith(autoMix: enabled),
-);
-
-void setAutoMixOptions(AutoMixOptions options) => musicPlayerRuntime.configure(
-  musicPlayerRuntime.settings.copyWith(
-    autoMixDuration: options.durationSeconds,
-    autoMixEffect: options.effect,
-    autoMixSpeed: options.speed,
-    autoMixPitch: options.pitchSemitones,
-    autoMixEcho: options.echo,
-    autoMixLowPass: options.lowPass,
-  ),
-);
-
-void setUsbBitPerfectEnabled(bool enabled) => musicPlayerRuntime.configure(
-  musicPlayerRuntime.settings.copyWith(usbBitPerfect: enabled),
-);
-
 /// Gain and rate the player applies to the current track.
 class PlaybackProcessing {
   const PlaybackProcessing({

test/music_player_automix_test.dart

@@ -227,6 +227,53 @@ Future<void> _until(bool Function() ready) async {
   fail('Playback did not reach the expected state');
 }
 
+void configurePlaybackNotification({
+  required PlaybackNotification presentation,
+  required Future<bool> Function(MediaItem) toggleFavorite,
+}) => musicPlayerRuntime.configureNotification(
+  presentation: presentation,
+  toggleFavorite: toggleFavorite,
+);
+
+void setPlaybackAutomationOptions({
+  required bool enabled,
+  required bool pauseOnMute,
+  required bool playOnHeadphonesConnected,
+}) => musicPlayerRuntime.configure(
+  musicPlayerRuntime.settings.copyWith(
+    playerMode: enabled ? 'internal' : 'external',
+    pauseOnMute: pauseOnMute,
+    playOnHeadphonesConnected: playOnHeadphonesConnected,
+  ),
+);
+
+void setAutoMixEnabled(bool enabled) => musicPlayerRuntime.configure(
+  musicPlayerRuntime.settings.copyWith(autoMix: enabled),
+);
+
+void setAutoMixOptions(AutoMixOptions options) => musicPlayerRuntime.configure(
+  musicPlayerRuntime.settings.copyWith(
+    autoMixDuration: options.durationSeconds,
+    autoMixEffect: options.effect,
+    autoMixSpeed: options.speed,
+    autoMixPitch: options.pitchSemitones,
+    autoMixEcho: options.echo,
+    autoMixLowPass: options.lowPass,
+  ),
+);
+
+void setUsbBitPerfectEnabled(bool enabled) => musicPlayerRuntime.configure(
+  musicPlayerRuntime.settings.copyWith(usbBitPerfect: enabled),
+);
+
+void setAutoplayEnabled(bool enabled, {bool includeLocal = true}) =>
+    musicPlayerRuntime.configure(
+      musicPlayerRuntime.settings.copyWith(
+        autoplay: enabled,
+        localLibraryEnabled: includeLocal,
+      ),
+    );
+
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
   SharedPreferences.setMockInitialValues({});