fix: 优化分享按钮布局+去掉重复推广入口

1. 阅读页分享按钮：改为全宽纵向排列
2. 新增复制文案功能
3. 我的页面：去掉顶部推广入口卡片（保留菜单中的推广中心）

miniprogram/pages/my/my.wxml

@@ -77,21 +77,6 @@
 
   <!-- 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/read/read.js

@@ -285,6 +285,22 @@ Page({
     })
   },
 
+  // 复制分享文案
+  copyShareText() {
+    const { section } = this.data
+    const userInfo = app.globalData.userInfo
+    const referralCode = userInfo?.referralCode || ''
+    
+    const shareText = `📚《Soul创业派对》推荐阅读\n\n【${section?.title || '精彩内容'}】\n\n来自派对房的真实商业故事，62个创业案例，干货满满！\n\n🎁 通过我的推荐购买立享5%优惠\n👉 邀请码：${referralCode || 'SOUL'}\n\n#创业派对 #私域运营 #商业案例`
+    
+    wx.setClipboardData({
+      data: shareText,
+      success: () => {
+        wx.showToast({ title: '文案已复制', icon: 'success' })
+      }
+    })
+  },
+
   // 分享到微信 - 自动带分享人ID
   onShareAppMessage() {
     const { section, sectionId } = this.data

miniprogram/pages/read/read.wxml

@@ -85,16 +85,24 @@
           <view class="action-header">
             <text class="action-title">分享这篇内容</text>
           </view>
-          <view class="action-buttons">
-            <button class="action-btn btn-share" open-type="share">
+          <view class="action-row">
+            <button class="action-btn-full btn-share-full" open-type="share">
               <text class="action-icon">💬</text>
               <text class="action-text">分享给好友</text>
             </button>
-            <view class="action-btn btn-poster" bindtap="generatePoster">
+          </view>
+          <view class="action-row">
+            <view class="action-btn-full btn-poster-full" bindtap="generatePoster">
               <text class="action-icon">🖼️</text>
               <text class="action-text">生成海报</text>
             </view>
           </view>
+          <view class="action-row">
+            <view class="action-btn-full btn-copy-full" bindtap="copyShareText">
+              <text class="action-icon">📝</text>
+              <text class="action-text">复制文案</text>
+            </view>
+          </view>
         </view>
 
       </view>

miniprogram/pages/read/read.wxss

@@ -414,38 +414,47 @@
   color: rgba(255, 255, 255, 0.6);
 }
 
-.action-buttons {
-  display: flex;
-  gap: 24rpx;
+.action-row {
+  margin-bottom: 16rpx;
 }
 
-.action-btn {
-  flex: 1;
+.action-row:last-child {
+  margin-bottom: 0;
+}
+
+.action-btn-full {
   display: flex;
   align-items: center;
   justify-content: center;
   gap: 12rpx;
+  width: 100%;
   padding: 28rpx 24rpx;
   border-radius: 20rpx;
   border: none;
   background: transparent;
   line-height: normal;
+  box-sizing: border-box;
 }
 
-.action-btn::after {
+.action-btn-full::after {
   border: none;
 }
 
-.btn-share {
+.btn-share-full {
   background: rgba(7, 193, 96, 0.15);
   border: 2rpx solid rgba(7, 193, 96, 0.3);
 }
 
-.btn-poster {
+.btn-poster-full {
   background: rgba(255, 215, 0, 0.15);
   border: 2rpx solid rgba(255, 215, 0, 0.3);
 }
 
+.btn-copy-full {
+  background: rgba(0, 206, 209, 0.15);
+  border: 2rpx solid rgba(0, 206, 209, 0.3);
+}
+
 .action-icon {
   font-size: 36rpx;
 }