feat: MBTI头像与用户规则链路升级，三端页面与接口同步

Made-with: Cursor

miniprogram/pages/match/match.wxml

@@ -121,7 +121,8 @@
         <!-- 用户卡片 -->
         <view class="match-card">
           <view class="card-header">
-            <image class="match-avatar" src="{{currentMatch.avatar}}" mode="aspectFill"></image>
+            <image wx:if="{{currentMatch.avatar}}" class="match-avatar" src="{{currentMatch.avatar}}" mode="aspectFill"></image>
+            <view wx:else class="match-avatar match-avatar-fallback"><text>{{currentMatch.nickname ? currentMatch.nickname[0] : '?'}}</text></view>
             <view class="match-info">
               <text class="match-name">{{currentMatch.nickname}}</text>
               <view class="match-tags">

miniprogram/pages/match/match.wxss

@@ -445,6 +445,20 @@
   flex-shrink: 0;
 }
 
+.match-avatar-fallback {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: rgba(0, 206, 209, 0.15);
+  box-sizing: border-box;
+}
+
+.match-avatar-fallback text {
+  font-size: 48rpx;
+  font-weight: 600;
+  color: #00CED1;
+}
+
 .match-info {
   flex: 1;
   min-width: 0;