现在的问题比较大，因为metadata的引入导致原有的部分播放进度信息推送错误

lib/metadata/metadata_model.dart

@@ -1,71 +1,74 @@
 // lib/metadata/metadata_model.dart
 import 'dart:typed_data';
 
-/// 从音频文件读取的原始元数据（未经任何处理）
+/// 从音频文件读取的原始元数据
 class RawMetadata {
   final String title;
   final String artist;
   final String album;
-  final String albumArtist;
-  final String composer;
-  final String genre;
+  final List<String> genres; // ⬅️ 改为 List<String>
+  final List<String> performers; // ⬅️ 新增
   final int year;
   final int trackNumber;
+  final int trackTotal;
   final int discNumber;
+  final int totalDisc;
+  final Duration? duration;
   final Uint8List? artwork;
 
   const RawMetadata({
     this.title = '',
     this.artist = '',
     this.album = '',
-    this.albumArtist = '',
-    this.composer = '',
-    this.genre = '',
+    this.genres = const [],
+    this.performers = const [],
     this.year = 0,
     this.trackNumber = 0,
+    this.trackTotal = 0,
     this.discNumber = 0,
+    this.totalDisc = 0,
+    this.duration,
     this.artwork,
   });
 
-  /// 判断是否为空（没有任何有效信息）
   bool get isEmpty =>
       title.isEmpty &&
       artist.isEmpty &&
       album.isEmpty &&
-      albumArtist.isEmpty &&
-      composer.isEmpty &&
-      genre.isEmpty &&
-      year == 0 &&
-      trackNumber == 0 &&
-      discNumber == 0 &&
-      artwork == null;
+      genres.isEmpty &&
+      performers.isEmpty &&
+      year == 0;
 
   bool get isNotEmpty => !isEmpty;
 }
 
-/// 经过标准化处理后的元数据
+/// 标准化后的元数据
 class NormalizedMetadata {
   final String title;
   final String artist;
   final String album;
-  final String albumArtist;
-  final String composer;
-  final String genre;
+  final List<String> genres;
+  final List<String> performers;
   final int year;
   final int trackNumber;
+  final int trackTotal;
   final int discNumber;
+  final int totalDisc;
+  final Duration? duration;
   final Uint8List? artwork;
 
   const NormalizedMetadata({
     this.title = '',
     this.artist = '',
     this.album = '',
-    this.albumArtist = '',
-    this.composer = '',
-    this.genre = '',
+    this.genres = const [],
+    this.performers = const [],
     this.year = 0,
     this.trackNumber = 0,
+    this.trackTotal = 0,
     this.discNumber = 0,
+    this.totalDisc = 0,
+    this.duration,
     this.artwork,
   });
 
@@ -73,54 +76,43 @@ class NormalizedMetadata {
       title.isEmpty &&
       artist.isEmpty &&
       album.isEmpty &&
-      albumArtist.isEmpty &&
-      composer.isEmpty &&
-      genre.isEmpty &&
-      year == 0 &&
-      trackNumber == 0 &&
-      discNumber == 0 &&
-      artwork == null;
+      genres.isEmpty &&
+      performers.isEmpty &&
+      year == 0;
 
   bool get isNotEmpty => !isEmpty;
 }
 
-/// 带置信度的候选元数据
-class CandidateMetadata {
-  final NormalizedMetadata metadata;
-  final double confidence; // 0.0 ~ 1.0
-  final Map<String, double> evidence; // 证据来源权重
-
-  const CandidateMetadata({
-    required this.metadata,
-    required this.confidence,
-    this.evidence = const {},
-  });
-}
-
 /// 最终确认的元数据
 class FinalMetadata {
   final String title;
   final String artist;
   final String album;
-  final String albumArtist;
-  final String composer;
-  final String genre;
+  final String genre; // ⬅️ 简化为单个流派（取第一个）
+  final List<String> genres; // ⬅️ 保留完整列表
+  final List<String> performers;
   final int year;
   final int trackNumber;
+  final int trackTotal;
   final int discNumber;
+  final int totalDisc;
+  final Duration? duration;
   final Uint8List? artwork;
-  final String source; // 'file_tag', 'filename', 'cache', 'user_corrected'
+  final String source;
 
   const FinalMetadata({
     this.title = '',
     this.artist = '',
     this.album = '',
-    this.albumArtist = '',
-    this.composer = '',
     this.genre = '',
+    this.genres = const [],
+    this.performers = const [],
     this.year = 0,
     this.trackNumber = 0,
+    this.trackTotal = 0,
     this.discNumber = 0,
+    this.totalDisc = 0,
+    this.duration,
     this.artwork,
     this.source = 'unknown',
   });
@@ -129,13 +121,23 @@ class FinalMetadata {
       title.isEmpty &&
       artist.isEmpty &&
       album.isEmpty &&
-      albumArtist.isEmpty &&
-      composer.isEmpty &&
       genre.isEmpty &&
-      year == 0 &&
-      trackNumber == 0 &&
-      discNumber == 0 &&
-      artwork == null;
+      genres.isEmpty &&
+      performers.isEmpty &&
+      year == 0;
 
   bool get isNotEmpty => !isEmpty;
 }
+
+/// 候选元数据
+class CandidateMetadata {
+  final NormalizedMetadata metadata;
+  final double confidence;
+  final Map<String, double> evidence;
+
+  const CandidateMetadata({
+    required this.metadata,
+    required this.confidence,
+    this.evidence = const {},
+  });
+}