更新开发文档，强调接口路径必须按使用方区分，禁止通用路径混用。新增小程序分享功能，统一使用推荐码，确保用户体验一致性。

miniprogram/pages/purchases/purchases.js

@@ -63,5 +63,13 @@ Page({
     wx.navigateTo({ url: `/pages/read/read?id=${id}` })
   },
 
-  goBack() { wx.navigateBack() }
+  goBack() { wx.navigateBack() },
+
+  onShareAppMessage() {
+    const ref = app.getMyReferralCode()
+    return {
+      title: 'Soul创业派对 - 购买记录',
+      path: ref ? `/pages/purchases/purchases?ref=${ref}` : '/pages/purchases/purchases'
+    }
+  }
 })