feat: 新增预约二维码弹窗功能

pages/records/records.wxml

@@ -23,7 +23,9 @@
   <view class="record-list" wx:if="{{!loading && filteredRecords.length > 0}}">
     <view class="record-card" wx:for="{{filteredRecords}}" wx:key="_id">
       <view class="record-header">
-        <text class="record-id">{{item._id}}</text>
+        <view wx:if="{{item.status === 'approved'}}" class="qrcode-btn" bindtap="showQrcode" data-id="{{item._id}}">
+          出示凭证
+        </view>
         <view class="status-tag status-{{item.status}}">
           {{item.statusText}}
         </view>
@@ -74,4 +76,7 @@
     <text class="empty-text">暂无预约记录</text>
     <view class="empty-btn" bindtap="goAppointment">去预约</view>
   </view>
+
+  <!-- 二维码弹窗 -->
+  <qrcode-modal visible="{{qrcodeVisible}}" qrcode-id="{{qrcodeId}}" bind:close="hideQrcode" />
 </view>