feat(playlist): 增加歌单收藏状态检查功能

- 新增 isPlaylistCollected 接口和相关实现
- 修改 toggleCollectPlaylist 函数，增加当前收藏状态参数
- 在前端 PlaylistDetail 组件中添加收藏状态检查逻辑
- 后端增加对应的控制层、服务层和实现类方法

music-houduan/src/main/java/com/test/musichouduan/controller/PlaylistController.java

@@ -189,6 +189,19 @@ public class PlaylistController {
         return Result.success("取消收藏成功", result);
     }
 
+    /**
+     * 检查当前用户是否收藏了该歌单
+     *
+     * @param id 歌单ID
+     * @return 响应结果
+     */
+    @SaCheckLogin
+    @GetMapping("/{id}/is-collected")
+    public Result<Boolean> isCollected(@PathVariable Long id) {
+        boolean result = playlistService.isCollected(id);
+        return Result.success(result);
+    }
+
     /**
      * 获取用户收藏的歌单列表
      *

music-houduan/src/main/java/com/test/musichouduan/controller/SingerController.java

@@ -175,6 +175,19 @@ public class SingerController {
         return Result.success("取消收藏成功", result);
     }
 
+    /**
+     * 检查当前用户是否收藏了该歌手
+     *
+     * @param id 歌手ID
+     * @return 响应结果
+     */
+    @SaCheckLogin
+    @GetMapping("/{id}/is-collected")
+    public Result<Boolean> isCollected(@PathVariable Long id) {
+        boolean result = singerService.isCollected(id);
+        return Result.success(result);
+    }
+
     /**
      * 获取用户收藏的歌手列表
      *

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

@@ -99,6 +99,14 @@ public interface PlaylistService {
      */
     boolean uncollectPlaylist(Long id);
 
+    /**
+     * 检查当前用户是否收藏了该歌单
+     *
+     * @param id 歌单ID
+     * @return 是否收藏
+     */
+    boolean isCollected(Long id);
+
     /**
      * 获取用户收藏的歌单列表
      *

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

@@ -90,6 +90,14 @@ public interface SingerService {
      */
     boolean uncollectSinger(Long id);
 
+    /**
+     * 检查当前用户是否收藏了该歌手
+     *
+     * @param id 歌手ID
+     * @return 是否收藏
+     */
+    boolean isCollected(Long id);
+
     /**
      * 获取用户收藏的歌手列表
      *

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

@@ -247,6 +247,7 @@ public class PlaylistServiceImpl implements PlaylistService {
         playlist.setCover(coverUrl);
         playlist.setCreator(user);
         playlist.setPlayCount(0L);
+        playlist.setCollectCount(0);
         playlist.setIsOfficial(0); // 默认为非官方歌单
 
         // 设置歌单类型
@@ -358,7 +359,7 @@ public class PlaylistServiceImpl implements PlaylistService {
         userPlaylistRepository.collectPlaylist(user.getId(), playlist.getId());
 
         // 更新收藏数
-        playlist.setCollectCount(playlist.getCollectCount() + 1);
+        playlist.setCollectCount((playlist.getCollectCount() == null ? 0 : playlist.getCollectCount()) + 1);
         playlistRepository.save(playlist);
 
         return true;
@@ -385,12 +386,21 @@ public class PlaylistServiceImpl implements PlaylistService {
         userPlaylistRepository.uncollectPlaylist(user.getId(), playlist.getId());
 
         // 更新收藏数
-        playlist.setCollectCount(playlist.getCollectCount() - 1);
+        playlist.setCollectCount((playlist.getCollectCount() == null ? 0 : playlist.getCollectCount()) - 1);
         playlistRepository.save(playlist);
 
         return true;
     }
 
+    @Override
+    public boolean isCollected(Long id) {
+        if (!StpUtil.isLogin()) {
+            return false;
+        }
+        Long userId = StpUtil.getLoginIdAsLong();
+        return userPlaylistRepository.existsByUserIdAndPlaylistId(userId, id);
+    }
+
     @Override
     public PageResult<PlaylistDTO> getCollectedPlaylist(Integer page, Integer size) {
         // 获取当前登录用户

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

@@ -214,6 +214,7 @@ public class SingerServiceImpl implements SingerService {
         singer.setName(singerDTO.getName());
         singer.setAvatar(avatarUrl);
         singer.setIntroduction(singerDTO.getIntroduction());
+        singer.setCollectCount(0);
 
         // 设置歌手类型
         if (singerDTO.getType() != null && singerDTO.getType().getId() != null) {
@@ -309,7 +310,7 @@ public class SingerServiceImpl implements SingerService {
         userSingerRepository.collectSinger(user.getId(), singer.getId());
 
         // 更新收藏数
-        singer.setCollectCount(singer.getCollectCount() + 1);
+        singer.setCollectCount((singer.getCollectCount() == null ? 0 : singer.getCollectCount()) + 1);
         singerRepository.save(singer);
 
         return true;
@@ -336,12 +337,21 @@ public class SingerServiceImpl implements SingerService {
         userSingerRepository.uncollectSinger(user.getId(), singer.getId());
 
         // 更新收藏数
-        singer.setCollectCount(singer.getCollectCount() - 1);
+        singer.setCollectCount((singer.getCollectCount() == null ? 0 : singer.getCollectCount()) - 1);
         singerRepository.save(singer);
 
         return true;
     }
 
+    @Override
+    public boolean isCollected(Long id) {
+        if (!StpUtil.isLogin()) {
+            return false;
+        }
+        Long userId = StpUtil.getLoginIdAsLong();
+        return userSingerRepository.existsByUserIdAndSingerId(userId, id);
+    }
+
     @Override
     public PageResult<SingerDTO> getCollectedSinger(Integer page, Integer size) {
         // 获取当前登录用户