fix: 修改头像预览问题

src/views/user/UserList.vue

@@ -1149,11 +1149,21 @@ const handleAvatarModify = async (row) => {
   avatarForm.user_id = row.UserId
   avatarForm.cover_id = row.CoverID || ''
   currentEditUser.value = row
-  
-  // 直接使用 row.avatarUrl（来自 user.cover）渲染当前头像
-  // row.avatarUrl 已经在 fetchUserList 中从 user.cover 映射过来
-  currentAvatarUrl.value = row.avatarUrl || ''
-  
+  currentAvatarUrl.value = ''
+
+  if (row.avatarUrl) {
+    currentAvatarUrl.value = row.avatarUrl
+  } else if (row.CoverID) {
+    try {
+      const res = await getFileDetail({ file_id: row.CoverID })
+      if (res.data.code === 200 && res.data.data?.url) {
+        currentAvatarUrl.value = res.data.data.url
+      }
+    } catch (error) {
+      console.error('获取头像失败:', error)
+    }
+  }
+
   avatarDialogVisible.value = true
 }