fix(MyFamily): 为成员头像添加aspectFill模式防止图片变形

修复成员头像显示变形问题，通过添加image的mode属性为aspectFill来保持图片比例

 <!--
  * @Date: 2022-09-19 14:11:06
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-09-03 16:18:16
+ * @LastEditTime: 2025-09-04 10:35:11
  * @FilePath: /lls_program/src/pages/MyFamily/index.vue
  * @Description: 我的家庭页面 - 展示用户加入的家庭列表
 -->
@@ -54,6 +54,7 @@
               <!-- 成员头像叠加效果 -->
               <view class="avatar-overlap">
                 <image
+                  mode="aspectFill"
                   v-for="(member, index) in family?.users?.slice(0, 4) || []"
                   :key="member.id"
                   :src="member.avatar_url || defaultAvatar"
@@ -444,7 +445,7 @@ const removeSelectedMembers = async () => {
           if (code) {
             // 从当前成员列表中移除选中的成员
             currentMembers.value = currentMembers.value.filter(m => !selectedMembers.value.includes(m.id));
-            
+
             // 同时更新家庭列表中对应家庭的成员数据
             const familyIndex = familyList.value.findIndex(f => f.id === currentFamily.value.id);
             if (familyIndex !== -1) {
@@ -452,7 +453,7 @@ const removeSelectedMembers = async () => {
                 user => !selectedMembers.value.includes(user.id)
               );
             }
-            
+
             selectedMembers.value = [];
 
             Taro.showToast({