feat: 数据概览简化 + 用户管理增加余额/提现列

- 数据概览：去掉代付统计独立卡片，总收入中以小标签显示代付金额
- 数据概览：移除余额统计区块（余额改在用户管理中展示）
- 数据概览：恢复转化率卡片（唯一付费用户/总用户）
- 用户管理：用户列表新增「余额/提现」列，显示钱包余额和已提现金额
- 后端：DBUsersList 增加 user_balances 查询，返回 walletBalance 字段
- 后端：User model 添加 WalletBalance 非数据库字段
- 包含之前的小程序埋点和管理后台点击统计面板

Made-with: Cursor

miniprogram/pages/index/index.wxml

@@ -38,18 +38,18 @@
     <!-- Banner卡片 - 最新章节（异步加载） -->
     <view class="banner-card" wx:if="{{latestSection}}" bindtap="goToRead" data-id="{{latestSection.id}}" data-mid="{{latestSection.mid}}">
       <view class="banner-glow"></view>
-      <view class="banner-tag">最新更新</view>
+      <view class="banner-tag">推荐</view>
       <view class="banner-title">{{latestSection.title}}</view>
       <view class="banner-action">
-        <text class="banner-action-text">开始阅读</text>
+        <text class="banner-action-text">点击阅读</text>
         <view class="banner-arrow">→</view>
       </view>
     </view>
     <view class="banner-card banner-skeleton" wx:else bindtap="goToChapters">
       <view class="banner-glow"></view>
-      <view class="banner-tag">最新更新</view>
+      <view class="banner-tag">推荐</view>
       <view class="banner-title">加载中...</view>
-      <view class="banner-action"><text class="banner-action-text">开始阅读</text><view class="banner-arrow">→</view></view>
+      <view class="banner-action"><text class="banner-action-text">点击阅读</text><view class="banner-arrow">→</view></view>
     </view>
 
     <!-- 超级个体（横向滚动，已去掉「查看全部」） -->
@@ -91,8 +91,8 @@
       </view>
     </view>
 
-    <!-- 精选推荐（带 tag，已去掉「查看全部」） -->
-    <view class="section">
+    <!-- 精选推荐（按热度排行，默认3篇，可展开更多） -->
+    <view class="section" wx:if="{{featuredSections.length > 0}}">
       <view class="section-header">
         <text class="section-title">精选推荐</text>
       </view>
@@ -107,22 +107,25 @@
         >
           <view class="featured-content">
             <view class="featured-meta">
-              <text class="featured-id brand-color">{{item.id}}</text>
-              <text class="featured-tag {{item.tagClass || 'tag-rec'}}">{{item.tag || '精选'}}</text>
+              <text class="featured-tag {{item.tagClass || 'tag-rec'}}" wx:if="{{item.tag}}">{{item.tag}}</text>
             </view>
             <text class="featured-title">{{item.title}}</text>
           </view>
           <view class="featured-arrow">›</view>
         </view>
       </view>
+      <view class="expand-btn" bindtap="toggleFeaturedExpand" wx:if="{{(featuredSectionsAll.length || 0) > 3}}">
+        <text class="expand-text">{{featuredExpanded ? '收起' : '展开更多'}}</text>
+        <text class="expand-icon">{{featuredExpanded ? '∧' : '∨'}}</text>
+      </view>
     </view>
 
-    <!-- 最新新增（时间线样式） -->
+    <!-- 最新新增（时间线样式）+ 展开/收起 -->
     <view class="section" wx:if="{{latestChapters.length > 0}}">
       <view class="section-header latest-header">
         <text class="section-title">最新新增</text>
         <view class="daily-badge-wrap">
-          <text class="daily-badge">+{{latestChapters.length}}</text>
+          <text class="daily-badge">+{{latestChaptersAll.length || latestChapters.length}}</text>
         </view>
       </view>
       <view class="timeline-wrap">
@@ -132,19 +135,19 @@
             <view class="timeline-dot"></view>
             <view class="timeline-content">
               <view class="timeline-row">
-                <view class="timeline-left">
-                  <text class="latest-new-tag">NEW</text>
-                  <text class="timeline-title">{{item.title}}</text>
-                </view>
-                <view class="timeline-right">
-                  <text class="timeline-price">¥{{item.price}}</text>
-                </view>
+                <text class="timeline-title">{{item.title}}</text>
               </view>
             </view>
           </view>
         </view>
       </view>
+      <!-- 展开/收起按钮 -->
+      <view class="expand-btn" bindtap="toggleLatestExpand" wx:if="{{(latestChaptersAll.length || 0) > 5}}">
+        <text class="expand-text">{{latestChaptersExpanded ? '收起' : '展开更多'}}</text>
+        <text class="expand-icon">{{latestChaptersExpanded ? '∧' : '∨'}}</text>
+      </view>
     </view>
+
   </view>
 
   <!-- 底部留白 -->