引入部分缓存机制

引入封面图信息

正在进入测试阶段

lib/metadata/metadata_model.dart

@@ -6,8 +6,8 @@ class RawMetadata {
   final String title;
   final String artist;
   final String album;
-  final List<String> genres; // ⬅️ 改为 List<String>
-  final List<String> performers; // ⬅️ 新增
+  final List<String> genres;
+  final List<String> performers;
   final int year;
   final int trackNumber;
   final int trackTotal;
@@ -83,13 +83,26 @@ class NormalizedMetadata {
   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 {},
+  });
+}
+
 /// 最终确认的元数据
 class FinalMetadata {
   final String title;
   final String artist;
   final String album;
-  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 String genre;
+  final List<String> genres;
   final List<String> performers;
   final int year;
   final int trackNumber;
@@ -128,16 +141,3 @@ class FinalMetadata {
 
   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 {},
-  });
-}