feat(singer): 添加歌手评论和收藏功能

- 在 CommentServiceImpl 中增加对歌手评论的处理逻辑- 在 SingerServiceImpl 中实现歌手收藏和取消收藏的功能
- 在前端 SingerDetail 组件中添加歌手的评论数、收藏数显示和相关操作

music-qianduan/src/views/SingerDetail.vue

@@ -183,6 +183,12 @@ const toggleCollect = async () => {
     const res = await toggleCollectSinger(singerId.value)
     if (res.code === 200) {
       isCollected.value = !isCollected.value
+      // 更新收藏数
+      if (isCollected.value) {
+        singer.value.collectCount++
+      } else {
+        singer.value.collectCount--
+      }
       ElMessage.success(isCollected.value ? '收藏成功' : '已取消收藏')
     } else {
       ElMessage.error(res.message || '操作失败')
@@ -274,6 +280,8 @@ const submitComment = async (isReply = false) => {
         commentContent.value = ''
       }
       ElMessage.success('评论已发送')
+      // 更新评论数
+      singer.value.commentCount++
     } else {
       ElMessage.error(res.message || '评论失败')
     }
@@ -295,6 +303,8 @@ const deleteComment = async (commentId) => {
     const res = await apiDeleteComment(commentId)
     if (res.code === 200) {
       comments.value = comments.value.filter(c => c.id !== commentId)
+      // 更新评论数
+      singer.value.commentCount--
       ElMessage.success('评论已删除')
     } else {
       ElMessage.error(res.message || '删除失败')
@@ -414,6 +424,14 @@ onUnmounted(() => {
               <div class="stat-value">{{ formatFans(singer.fansCount || 0) }}</div>
               <div class="stat-label">粉丝数</div>
             </div>
+            <div class="stat-item">
+              <div class="stat-value">{{ singer.collectCount || 0 }}</div>
+              <div class="stat-label">收藏数</div>
+            </div>
+            <div class="stat-item">
+              <div class="stat-value">{{ singer.commentCount || 0 }}</div>
+              <div class="stat-label">评论数</div>
+            </div>
           </div>
           <div class="singer-intro">{{ singer.introduction }}</div>
 
@@ -500,7 +518,7 @@ onUnmounted(() => {
 
 
 
-        <el-tab-pane label="评论">
+        <el-tab-pane :label="`评论(${singer.commentCount || 0})`">
           <!-- 评论输入框 -->
           <div class="comment-input">
             <el-input