refactor(music-houduan): 修改用户收藏歌单的逻辑

- 移除了 UserCollectPlaylist 中的 collectTime 字段
- 使用 createTime 字段来记录收藏时间
- 更新了相关查询和排序逻辑

music-houduan/src/main/java/com/test/musichouduan/entity/UserCollectPlaylist.java

@@ -35,6 +35,7 @@ public class UserCollectPlaylist {
     /**
      * 收藏时间
      */
+    @CreationTimestamp
     @Column(nullable = false, updatable = false)
-    private LocalDateTime collectTime;
+    private LocalDateTime createTime;
 }

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

@@ -375,7 +375,6 @@ public class PlaylistServiceImpl implements PlaylistService {
         com.test.musichouduan.entity.UserCollectPlaylist userCollectPlaylist = new com.test.musichouduan.entity.UserCollectPlaylist();
         userCollectPlaylist.setUser(user);
         userCollectPlaylist.setPlaylist(playlist);
-        userCollectPlaylist.setCollectTime(java.time.LocalDateTime.now());
         userCollectPlaylistRepository.save(userCollectPlaylist);
 
         // 更新收藏数
@@ -429,7 +428,7 @@ public class PlaylistServiceImpl implements PlaylistService {
         // 获取用户收藏的歌单
         Page<Playlist> playlistPage = userCollectPlaylistRepository.findCollectedPlaylist(
                 userId,
-                PageRequest.of(page - 1, size, Sort.by(Sort.Direction.DESC, "collectTime"))
+                PageRequest.of(page - 1, size, Sort.by(Sort.Direction.DESC, "createTime"))
         );
 
         // 转换为DTO
@@ -438,7 +437,7 @@ public class PlaylistServiceImpl implements PlaylistService {
                     PlaylistDTO dto = convertToDTO(playlist);
                     // 从收藏记录中获取收藏时间
                     userCollectPlaylistRepository.findByUserIdAndPlaylistId(userId, playlist.getId())
-                            .ifPresent(ucp -> dto.setCollectTime(ucp.getCollectTime()));
+                            .ifPresent(ucp -> dto.setCollectTime(ucp.getCreateTime()));
                     return dto;
                 })
                 .collect(Collectors.toList());