refactor(admin): 重构歌单管理功能提升代码质量

- 移除未使用的 computed 导入语句
- 添加错误处理工具 showErrorOnce 的导入
- 新增 playlistMusics 响应式变量存储歌单音乐数据
- 优化歌单详情加载逻辑，完善异常情况的数据重置
- 在音乐添加和移除操作后同步更新歌单列表数据
- 添加统一的错误处理机制替代原有 console.error
- 重构歌单权限校验逻辑，提取为独立的验证方法
- 增强管理员权限支持，允许后台管理员维护用户歌单

music-qianduan/src/views/admin/Playlist.vue

@@ -1,9 +1,10 @@
 <script setup>
-import { ref, onMounted, computed } from 'vue'
+import { ref, onMounted } from 'vue'
 import { ElMessage, ElMessageBox } from 'element-plus'
 import { getPlaylistList, getPlaylistById, addPlaylist as apiAddPlaylist, updatePlaylist as apiUpdatePlaylist, deletePlaylist as apiDeletePlaylist } from '../../api/playlist'
 import { getPlaylistTypeList } from '../../api/playlistType'
 import { processMusicUrl } from '../../api/music'
+import { showErrorOnce } from '../../utils/errorHandler'
 
 // 歌单列表
 const playlistList = ref([])
@@ -251,6 +252,7 @@ const musicDialogVisible = ref(false)
 const currentPlaylistId = ref(null)
 const currentPlaylistName = ref('')
 const musicList = ref([])
+const playlistMusics = ref([])
 const selectedMusicIds = ref([])
 const musicSearchKeyword = ref('')
 const musicLoading = ref(false)
@@ -278,10 +280,17 @@ const fetchPlaylistMusic = async (playlistId) => {
   try {
     const res = await getPlaylistById(playlistId)
     if (res.code === 200 && res.data.musics) {
+      playlistMusics.value = res.data.musics
       selectedMusicIds.value = res.data.musics.map(m => m.id)
+    } else {
+      playlistMusics.value = []
+      selectedMusicIds.value = []
     }
   } catch (error) {
     console.error('获取歌单音乐失败:', error)
+    playlistMusics.value = []
+    selectedMusicIds.value = []
+    showErrorOnce(error, '获取歌单音乐失败')
   }
 }
 
@@ -290,6 +299,8 @@ const managePlaylistMusic = async (row) => {
   currentPlaylistId.value = row.id
   currentPlaylistName.value = row.name
   musicSearchKeyword.value = ''
+  playlistMusics.value = []
+  selectedMusicIds.value = []
   musicDialogVisible.value = true
   
   // 加载音乐列表和已选音乐
@@ -305,13 +316,16 @@ const addMusicToPlaylistLocal = async (musicId) => {
     const res = await addMusicToPlaylist(currentPlaylistId.value, musicId)
     if (res.code === 200) {
       ElMessage.success('添加成功')
-      await fetchPlaylistMusic(currentPlaylistId.value)
+      await Promise.all([
+        fetchPlaylistMusic(currentPlaylistId.value),
+        fetchPlaylistList()
+      ])
     } else {
       ElMessage.error(res.message || '添加失败')
     }
   } catch (error) {
     console.error('添加音乐失败:', error)
-    ElMessage.error('添加失败')
+    showErrorOnce(error, '添加失败')
   }
 }
 
@@ -321,13 +335,16 @@ const removeMusicFromPlaylistLocal = async (musicId) => {
     const res = await removeMusicFromPlaylist(currentPlaylistId.value, musicId)
     if (res.code === 200) {
       ElMessage.success('移除成功')
-      await fetchPlaylistMusic(currentPlaylistId.value)
+      await Promise.all([
+        fetchPlaylistMusic(currentPlaylistId.value),
+        fetchPlaylistList()
+      ])
     } else {
       ElMessage.error(res.message || '移除失败')
     }
   } catch (error) {
     console.error('移除音乐失败:', error)
-    ElMessage.error('移除失败')
+    showErrorOnce(error, '移除失败')
   }
 }
 
@@ -737,7 +754,7 @@ import { addMusicToPlaylist, removeMusicFromPlaylist } from '../../api/playlist'
         <div class="selected-music-container">
           <h3>已添加的音乐</h3>
           <el-table
-            :data="musicList.filter(m => selectedMusicIds.includes(m.id))"
+            :data="playlistMusics"
             stripe
             style="width: 100%"
             empty-text="暂无音乐"