fix(views): 修复用户头像为空时显示默认头像

 <!--
   * @Date: 2025-05-29 15:34:17
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-06-15 22:47:49
+ * @LastEditTime: 2025-06-15 22:49:42
  * @FilePath: /mlaj/src/views/checkin/IndexCheckInPage.vue
   * @Description: 文件描述
 -->
@@ -81,7 +81,7 @@
             <div class="post-header">
               <van-row>
                 <van-col span="4">
-                  <van-image round width="2.5rem" height="2.5rem" :src="post.user.avatar" fit="cover" />
+                  <van-image round width="2.5rem" height="2.5rem" :src="post.user.avatar || 'https://cdn.ipadbiz.cn/mlaj/images/icon_1.jpeg'" fit="cover" />
                 </van-col>
                 <van-col span="17">
                   <div class="user-info">