Add 卓米会 mini program and admin server.

Initial commit of the WeChat mini program, Express backend, and admin console.

Co-authored-by: Cursor <cursoragent@cursor.com>

miniprogram/pages/mine/mine.wxml

@@ -0,0 +1,35 @@
+<view class="page">
+  <view class="card profile" hover-class="pressed" bindtap="goProfile">
+    <image wx:if="{{avatarUrl}}" class="avatar" src="{{avatarUrl}}" mode="aspectFill" />
+    <view wx:else class="avatar letter">{{letter}}</view>
+    <view class="who">
+      <text class="name">{{nickName || '微信用户'}}</text>
+      <text class="edit">点击编辑资料</text>
+    </view>
+  </view>
+
+  <view class="card block">
+    <text class="heading">我的报名</text>
+    <view wx:if="{{!signups.length}}" class="empty">暂无报名记录，去首页报名吧</view>
+    <view wx:for="{{signups}}" wx:key="id" class="item">
+      <view class="item-main">
+        <text class="item-title">{{item.activityTitle}}</text>
+        <text class="item-sub">{{nickName || item.name}} · {{item.phone}}</text>
+      </view>
+      <text class="tag {{item.checkedIn ? 'on' : ''}}">{{item.checkedIn ? '已签到' : '未签到'}}</text>
+    </view>
+  </view>
+
+  <view class="card block">
+    <text class="heading">签到记录</text>
+    <view wx:if="{{!checkins.length}}" class="empty">暂无签到记录</view>
+    <view wx:for="{{checkins}}" wx:key="id" class="item">
+      <view class="item-main">
+        <text class="item-title">{{item.activityTitle}}</text>
+        <text class="item-sub">已签到</text>
+      </view>
+    </view>
+  </view>
+
+  <view class="scan" hover-class="scan-pressed" bindtap="checkin">模拟现场扫码签到</view>
+</view>