feat: 全面优化小程序界面和功能

✨ 新增功能:
- 配置后台匹配规则选择功能，支持多种匹配类型自定义
- 推广中心使用真实数据，实现H5/小程序绑定关系
- 配置MySQL数据库连接，建立完整数据表结构

🎨 界面优化:
- 优化登录状态显示，未登录只显示基础功能
- 修复推广中心等页面宽度问题，统一界面布局
- 优化设置页面绑定弹窗样式，简洁大气
- 修复目录页图标和文字对齐问题

🔧 技术改进:
- 匹配功能支持后台配置，动态加载匹配类型
- 推广数据支持API获取，本地存储作为备份
- 数据库表结构完整，支持用户、订单、推广关系
- 小程序登录仅保留微信登录方式

📱 小程序优化:
- 匹配次数调整为每日3次免费
- 支持¥1购买额外匹配次数
- 分享到朋友圈功能优化
- 界面宽度统一，卡片布局一致

miniprogram/pages/match/match.wxml

@@ -12,20 +12,20 @@
   </view>
   <view class="nav-placeholder" style="height: {{statusBarHeight + 44}}px;"></view>
 
-  <!-- 匹配次数显示 - 仅购买用户显示 -->
-  <view class="match-count-bar" wx:if="{{hasPurchased}}">
+  <!-- 匹配次数显示 - 所有用户可见 -->
+  <view class="match-count-bar">
     <view class="count-left">
       <text class="count-icon {{matchesRemaining <= 0 && !hasFullBook ? 'icon-warning' : ''}}">⚡</text>
       <text class="count-text">
-        {{hasFullBook ? '无限匹配机会' : matchesRemaining <= 0 ? '今日匹配机会已用完' : '剩余匹配机会'}}
+        {{hasFullBook ? '无限匹配机会' : matchesRemaining <= 0 ? '今日免费次数已用完' : '今日剩余'}}
       </text>
     </view>
     <view class="count-right">
       <text class="count-value {{matchesRemaining > 0 || hasFullBook ? 'text-brand' : 'text-red'}}">
-        {{hasFullBook ? '无限' : matchesRemaining + '/' + totalMatchesAllowed}}
+        {{hasFullBook ? '∞' : matchesRemaining + '次'}}
       </text>
-      <view class="unlock-mini-btn" wx:if="{{matchesRemaining <= 0 && !hasFullBook}}" bindtap="goToChapters">
-        购买小节+1次
+      <view class="unlock-mini-btn" wx:if="{{matchesRemaining <= 0 && !hasFullBook}}" bindtap="showUnlockModal">
+        ¥1购买1次
       </view>
     </view>
   </view>
@@ -35,36 +35,24 @@
     <!-- 空闲状态 - 未匹配 -->
     <block wx:if="{{!isMatching && !currentMatch}}">
       <!-- 中央匹配圆环 -->
-      <view 
-        class="match-circle-wrapper" 
-        bindtap="{{hasPurchased ? 'handleMatchClick' : 'showPurchaseTip'}}"
-      >
+      <view class="match-circle-wrapper" bindtap="handleMatchClick">
         <!-- 外层光环 -->
-        <view class="outer-glow {{hasPurchased ? 'glow-active' : 'glow-inactive'}}"></view>
+        <view class="outer-glow glow-active"></view>
         <!-- 中间光环 -->
-        <view class="middle-ring {{hasPurchased ? 'ring-active' : 'ring-inactive'}}"></view>
+        <view class="middle-ring ring-active"></view>
         <!-- 内层球体 -->
-        <view class="inner-sphere {{hasPurchased ? 'sphere-active' : 'sphere-inactive'}}">
+        <view class="inner-sphere sphere-active">
           <view class="sphere-gradient"></view>
           <view class="sphere-content">
-            <!-- 已购买用户 -->
-            <block wx:if="{{hasPurchased}}">
-              <block wx:if="{{needPayToMatch}}">
-                <text class="sphere-icon">⚡</text>
-                <text class="sphere-title gold-text">需要解锁</text>
-                <text class="sphere-desc">今日免费次数已用完</text>
-              </block>
-              <block wx:else>
-                <text class="sphere-icon">👥</text>
-                <text class="sphere-title">开始匹配</text>
-                <text class="sphere-desc">匹配{{currentTypeLabel}}</text>
-              </block>
+            <block wx:if="{{needPayToMatch}}">
+              <text class="sphere-icon">⚡</text>
+              <text class="sphere-title gold-text">购买次数</text>
+              <text class="sphere-desc">¥1 = 1次匹配</text>
             </block>
-            <!-- 未购买用户 -->
             <block wx:else>
-              <text class="sphere-icon">🔒</text>
-              <text class="sphere-title text-gray">购买后解锁</text>
-              <text class="sphere-desc text-muted">购买9.9元即可使用</text>
+              <text class="sphere-icon">👥</text>
+              <text class="sphere-title">开始匹配</text>
+              <text class="sphere-desc">匹配{{currentTypeLabel}}</text>
             </block>
           </view>
         </view>
@@ -72,16 +60,12 @@
 
       <!-- 当前模式显示 -->
       <view class="current-mode">
-        当前模式: <text class="{{hasPurchased ? 'text-brand' : 'text-muted'}}">{{currentTypeLabel}}</text>
+        当前模式: <text class="text-brand">{{currentTypeLabel}}</text>
       </view>
 
-      <!-- 购买提示 - 仅未购买用户显示 -->
-      <view class="purchase-tip-card" wx:if="{{!hasPurchased}}">
-        <view class="tip-left">
-          <text class="tip-title">购买书籍解锁匹配功能</text>
-          <text class="tip-desc">仅需9.9元，每天免费匹配</text>
-        </view>
-        <view class="tip-btn" bindtap="goToChapters">去购买</view>
+      <!-- 免费次数提示 -->
+      <view class="free-tip" wx:if="{{!hasFullBook}}">
+        每天{{totalMatchesAllowed}}次免费匹配，用完可付费购买
       </view>
 
       <!-- 分隔线 -->
@@ -258,22 +242,22 @@
   <view class="modal-overlay" wx:if="{{showUnlockModal}}" bindtap="closeUnlockModal">
     <view class="modal-content unlock-modal" catchtap="preventBubble">
       <view class="unlock-icon">⚡</view>
-      <text class="unlock-title">匹配机会已用完</text>
-      <text class="unlock-desc">每购买一个小节内容即可额外获得1次匹配机会</text>
+      <text class="unlock-title">购买匹配次数</text>
+      <text class="unlock-desc">今日3次免费匹配已用完，可付费购买额外次数</text>
       
       <view class="unlock-info">
         <view class="info-row">
-          <text class="info-label">解锁方式</text>
-          <text class="info-value">购买任意小节</text>
+          <text class="info-label">单价</text>
+          <text class="info-value text-brand">¥1 / 次</text>
         </view>
         <view class="info-row">
-          <text class="info-label">获得次数</text>
-          <text class="info-value text-brand">+1次匹配</text>
+          <text class="info-label">已购买</text>
+          <text class="info-value">{{extraMatches || 0}} 次</text>
         </view>
       </view>
 
       <view class="unlock-buttons">
-        <view class="btn-gold" bindtap="goToChapters">去购买小节 (¥1/节)</view>
+        <view class="btn-gold" bindtap="buyMatchCount">立即购买 ¥1</view>
         <view class="btn-ghost" bindtap="closeUnlockModal">明天再来</view>
       </view>
     </view>