feat: 优化推广中心入口+修复API

1. 我的页面：添加推广中心入口卡片
2. 推广中心：去掉邀请码显示，改名推广中心
3. 阅读页：去掉底部推广提示（已移到我的页面）
4. 修复PM2启动配置（PORT=3006）

miniprogram/pages/my/my.wxml

@@ -77,6 +77,21 @@
 
   <!-- 概览内容 - 仅登录用户显示 -->
   <view class="tab-content" wx:if="{{activeTab === 'overview' && isLoggedIn}}">
+    <!-- 推广入口卡片 -->
+    <view class="promo-entry-card" bindtap="goToReferral">
+      <view class="promo-entry-left">
+        <view class="promo-entry-icon">💰</view>
+        <view class="promo-entry-info">
+          <text class="promo-entry-title">推广中心</text>
+          <text class="promo-entry-desc">邀请好友购买，享90%推广收益</text>
+        </view>
+      </view>
+      <view class="promo-entry-right">
+        <text class="promo-entry-earnings" wx:if="{{earnings > 0}}">¥{{earnings}}</text>
+        <text class="promo-entry-arrow">→</text>
+      </view>
+    </view>
+
     <!-- 菜单列表 -->
     <view class="menu-card card">
       <view 

miniprogram/pages/my/my.wxss

@@ -777,3 +777,66 @@
 .bottom-space {
   height: 40rpx;
 }
+
+/* ===== 推广入口卡片 ===== */
+.promo-entry-card {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin: 24rpx 24rpx 0;
+  padding: 32rpx;
+  background: linear-gradient(135deg, rgba(255, 215, 0, 0.15) 0%, rgba(255, 165, 0, 0.1) 100%);
+  border: 2rpx solid rgba(255, 215, 0, 0.3);
+  border-radius: 24rpx;
+}
+
+.promo-entry-left {
+  display: flex;
+  align-items: center;
+  gap: 20rpx;
+}
+
+.promo-entry-icon {
+  width: 80rpx;
+  height: 80rpx;
+  background: rgba(255, 215, 0, 0.2);
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 36rpx;
+}
+
+.promo-entry-info {
+  display: flex;
+  flex-direction: column;
+  gap: 4rpx;
+}
+
+.promo-entry-title {
+  font-size: 30rpx;
+  color: #ffffff;
+  font-weight: 600;
+}
+
+.promo-entry-desc {
+  font-size: 24rpx;
+  color: rgba(255, 255, 255, 0.5);
+}
+
+.promo-entry-right {
+  display: flex;
+  align-items: center;
+  gap: 16rpx;
+}
+
+.promo-entry-earnings {
+  font-size: 32rpx;
+  color: #FFD700;
+  font-weight: 600;
+}
+
+.promo-entry-arrow {
+  font-size: 28rpx;
+  color: #FFD700;
+}

miniprogram/pages/read/read.wxml

@@ -97,21 +97,6 @@
           </view>
         </view>
 
-        <!-- 推广提示 -->
-        <view class="promo-section">
-          <view class="promo-card" bindtap="goToReferral">
-            <view class="promo-left">
-              <view class="promo-icon">💰</view>
-              <view class="promo-info">
-                <text class="promo-title">推荐好友，共同成长</text>
-                <text class="promo-desc">邀请好友购买，享90%推广收益</text>
-              </view>
-            </view>
-            <view class="promo-right">
-              <text class="promo-arrow">→</text>
-            </view>
-          </view>
-        </view>
       </view>
     </view>
 

miniprogram/pages/referral/referral.wxml

@@ -5,7 +5,7 @@
     <view class="nav-back" bindtap="goBack">
       <text class="back-icon">‹</text>
     </view>
-    <text class="nav-title">分销中心</text>
+    <text class="nav-title">推广中心</text>
     <view class="nav-right">
       <view class="nav-btn" bindtap="showNotification">🔔</view>
       <view class="nav-btn" bindtap="showSettings">⚙️</view>
@@ -150,17 +150,6 @@
       </block>
     </view>
 
-    <!-- 我的邀请码 -->
-    <view class="invite-card">
-      <view class="invite-header">
-        <text class="invite-title">我的邀请码</text>
-        <view class="invite-code-box">
-          <text class="invite-code">{{referralCode}}</text>
-        </view>
-      </view>
-      <text class="invite-tip">好友通过你的链接购买<text class="gold">立省5%</text>，你获得<text class="brand">{{distributorShare}}%</text>收益</text>
-    </view>
-
     <!-- 分享按钮 -->
     <view class="share-section">
       <view class="share-item" bindtap="generatePoster">