feat: add user balance

frontend/wechat/src/views/UserProfile.vue

@@ -44,11 +44,12 @@ const menuGroups = [
             <div>
                 <h3 class="text-xl font-medium">{{ userInfo.username }}</h3>
                 <span class="text-gray-500">用户编号: {{ userInfo.id }}</span>
+                <span class="text-gray-500">账户余额: {{ (userInfo.balance / 100).toFixed(2) }}</span>
             </div>
         </div>
     </div>
 
-    <div class="menus space-y-4 mt-4 px-4">
+    <div class="menus space-y-4 mt-4 px-4 hidden">
         <div v-for="(group, groupIndex) in menuGroups" :key="groupIndex" class="bg-white rounded-lg overflow-hidden">
             <div class="px-4 py-2 text-sm text-gray-500">{{ group.title }}</div>
             <div class="divide-y divide-gray-100">