feat(playlist): 添加歌单编辑功能

- 在前端 PlaylistDetail组件中添加编辑歌单的对话框和相关逻辑
- 在后端 PlaylistServiceImpl 中实现更新歌单信息和封面的方法
- 优化封面上传逻辑，将物理路径转换为相对路径

music-houduan/src/main/java/com/test/musichouduan/service/impl/PlaylistServiceImpl.java

@@ -36,6 +36,7 @@ import org.springframework.util.StringUtils;
 import org.springframework.web.multipart.MultipartFile;
 
 import jakarta.persistence.criteria.Predicate;
+import java.io.File;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Collectors;
@@ -237,7 +238,8 @@ public class PlaylistServiceImpl implements PlaylistService {
         // 上传封面
         String coverUrl = null;
         if (cover != null && !cover.isEmpty()) {
-            coverUrl = fileService.uploadImage(cover);
+            String coverPhysicalPath = fileService.uploadImage(cover);
+            coverUrl = coverPhysicalPath.replace(System.getProperty("user.dir") + File.separator + "music-houduan", "").replace(File.separator, "/");
         }
 
         // 创建歌单实体
@@ -286,7 +288,8 @@ public class PlaylistServiceImpl implements PlaylistService {
             }
 
             // 上传新封面
-            String coverUrl = fileService.uploadImage(cover);
+            String coverPhysicalPath = fileService.uploadImage(cover);
+            String coverUrl = coverPhysicalPath.replace(System.getProperty("user.dir") + File.separator + "music-houduan", "").replace(File.separator, "/");
             playlist.setCover(coverUrl);
         }