feat(singer): 添加歌手评论数和收藏数功能

- 在 SingerDetail.vue 中添加评论数和收藏数的格式化计算属性
- 更新后端 SingerServiceImpl 类，添加评论数和收藏数的查询逻辑
- 在前端页面中使用格式化的评论数和收藏数

music-qianduan/src/views/SingerDetail.vue

@@ -125,6 +125,9 @@ const fetchComments = async () => {
     const res = await getCommentList(singerId.value, 3, 1, 20) // targetType 3 表示歌手
     if (res.code === 200) {
       comments.value = res.data.list || res.data.records || []
+      if (singer.value && res.data.total !== undefined) {
+        singer.value.commentCount = res.data.total
+      }
 
       // 处理用户头像
       comments.value.forEach(comment => {
@@ -393,6 +396,28 @@ const formatTime = (seconds) => {
   return `${mins.toString().padStart(2, '0')}:${secs.toString().padStart(2, '0')}`
 }
 
+// 格式化评论数
+const formattedCommentCount = computed(() => {
+  if (!singer.value || singer.value.commentCount === undefined) {
+    return 0;
+  }
+  if (singer.value.commentCount > 99) {
+    return '99+';
+  }
+  return singer.value.commentCount;
+});
+
+// 格式化收藏数
+const formattedCollectCount = computed(() => {
+  if (!singer.value || singer.value.collectCount === undefined) {
+    return 0;
+  }
+  if (singer.value.collectCount > 99) {
+    return '99+';
+  }
+  return singer.value.collectCount;
+});
+
 // 格式化粉丝数
 const formatFans = (count) => {
   if (count < 10000) {
@@ -477,11 +502,11 @@ onUnmounted(() => {
               <div class="stat-label">粉丝数</div>
             </div>
             <div class="stat-item">
-              <div class="stat-value">{{ singer.collectCount || 0 }}</div>
+              <div class="stat-value">{{ formattedCollectCount }}</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-value">{{ formattedCommentCount }}</div>
               <div class="stat-label">评论数</div>
             </div>
           </div>
@@ -517,7 +542,7 @@ onUnmounted(() => {
 
 
 
-        <el-tab-pane :label="`评论(${singer.commentCount || 0})`">
+        <el-tab-pane :label="`评论(${formattedCommentCount})`">
           <!-- 评论输入框 -->
           <div class="comment-input">
             <el-input