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_normalizer.dart

@@ -2,39 +2,43 @@
 import 'metadata_model.dart';
 
 class MetadataNormalizer {
-  /// 标准化原始数据（清洗空格、推断、fallback）
   NormalizedMetadata normalize(RawMetadata raw,
       {String fileName = '', String filePath = ''}) {
     // 1. 修剪空格
     final title = raw.title.trim();
     final artist = raw.artist.trim();
     final album = raw.album.trim();
-    final albumArtist = raw.albumArtist.trim();
 
-    // 2. 如果 title 为空，尝试从文件名推断
+    // 2. 如果 title 为空，从文件名推断
     final finalTitle =
         title.isNotEmpty ? title : _inferTitleFromFileName(fileName);
 
-    // 3. 如果 artist 为空，尝试从路径推断或使用默认值
+    // 3. 如果 artist 为空，从路径推断或使用默认值
     final finalArtist =
         artist.isNotEmpty ? artist : _inferArtistFromPath(filePath);
 
+    // 4. 如果 performers 不为空且 artist 为空，用 performers 的第一个
+    final finalArtist2 = finalArtist.isNotEmpty
+        ? finalArtist
+        : (raw.performers.isNotEmpty ? raw.performers.first : '未知艺术家');
+
     return NormalizedMetadata(
       title: finalTitle,
-      artist: finalArtist,
+      artist: finalArtist2,
       album: album,
-      albumArtist: albumArtist,
-      composer: raw.composer.trim(),
-      genre: raw.genre.trim(),
+      genres: raw.genres,
+      performers: raw.performers,
       year: raw.year,
       trackNumber: raw.trackNumber,
+      trackTotal: raw.trackTotal,
       discNumber: raw.discNumber,
+      totalDisc: raw.totalDisc,
+      duration: raw.duration,
       artwork: raw.artwork,
     );
   }
 
   String _inferTitleFromFileName(String fileName) {
-    // 去掉扩展名
     final dotIndex = fileName.lastIndexOf('.');
     if (dotIndex > 0) {
       return fileName.substring(0, dotIndex).trim();
@@ -43,10 +47,8 @@ class MetadataNormalizer {
   }
 
   String _inferArtistFromPath(String filePath) {
-    // 简单推断：尝试从路径中的文件夹名获取
     final parts = filePath.split(RegExp(r'[/\\]'));
     if (parts.length >= 2) {
-      // 倒数第二个文件夹可能是艺术家
       final candidate = parts[parts.length - 2].trim();
       if (candidate.isNotEmpty && !candidate.contains(' ')) {
         return candidate;
@@ -55,10 +57,8 @@ class MetadataNormalizer {
     return '未知艺术家';
   }
 
-  /// 评估候选元数据（第一阶段：直接接受，不纠错）
   CandidateMetadata evaluate(
       NormalizedMetadata normalized, List<Map<String, dynamic>> history) {
-    // 第一阶段：置信度固定为 0.8（文件名+标签混合）
     return CandidateMetadata(
       metadata: normalized,
       confidence: 0.8,
@@ -66,18 +66,22 @@ class MetadataNormalizer {
     );
   }
 
-  /// 决策是否修正（第一阶段：直接接受）
   FinalMetadata decide(CandidateMetadata candidate, {double threshold = 0.6}) {
     return FinalMetadata(
       title: candidate.metadata.title,
       artist: candidate.metadata.artist,
       album: candidate.metadata.album,
-      albumArtist: candidate.metadata.albumArtist,
-      composer: candidate.metadata.composer,
-      genre: candidate.metadata.genre,
+      genre: candidate.metadata.genres.isNotEmpty
+          ? candidate.metadata.genres.first
+          : '',
+      genres: candidate.metadata.genres,
+      performers: candidate.metadata.performers,
       year: candidate.metadata.year,
       trackNumber: candidate.metadata.trackNumber,
+      trackTotal: candidate.metadata.trackTotal,
       discNumber: candidate.metadata.discNumber,
+      totalDisc: candidate.metadata.totalDisc,
+      duration: candidate.metadata.duration,
       artwork: candidate.metadata.artwork,
       source: 'normalized',
     );