只保留Android支持

lib/services/audio_service.dart

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+import 'package:flutter/material.dart';
+import '../models/song_model.dart';
+
+// 这是一个 ChangeNotifier，以后用来刷新底部的迷你播放条
+class AudioService extends ChangeNotifier {
+  Song? _currentSong;
+  bool _isPlaying = false;
+
+  Song? get currentSong => _currentSong;
+  bool get isPlaying => _isPlaying;
+
+  // 占位方法：以后这里会调用 media_kit
+  void playSong(Song song) {
+    _currentSong = song;
+    _isPlaying = true;
+    notifyListeners(); // 刷新 UI
+    print('🎵 准备播放: ${song.title} - ${song.artist}');
+  }
+
+  void togglePlay() {
+    _isPlaying = !_isPlaying;
+    notifyListeners();
+  }
+}