更新管理后台布局，优化菜单项标签，新增支付配置项。同时，调整API响应字段命名，确保一致性，提升代码可读性和维护性。

miniprogram/pages/withdraw-records/withdraw-records.js

@@ -34,7 +34,7 @@ Page({
           amount: (item.amount != null ? item.amount : 0).toFixed(2),
           status: this.statusText(item.status),
           statusRaw: item.status,
-          created_at: item.created_at ? this.formatDate(item.created_at) : '--'
+          createdAt: (item.createdAt ?? item.created_at) ? this.formatDate(item.createdAt ?? item.created_at) : '--'
         }))
         this.setData({ list, loading: false })
       } else {

miniprogram/pages/withdraw-records/withdraw-records.wxml

@@ -13,7 +13,7 @@
       <view class="item" wx:for="{{list}}" wx:key="id">
         <view class="item-left">
           <text class="amount">¥{{item.amount}}</text>
-          <text class="time">{{item.created_at}}</text>
+          <text class="time">{{item.createdAt}}</text>
         </view>
         <text class="status status-{{item.statusRaw}}">{{item.status}}</text>
       </view>