新增订单推荐人和邀请码功能，优化支付流程中的订单插入逻辑，确保订单记录准确。更新小程序支付请求，支持传递邀请码以便于分销归属和对账。同时，调整数据库结构以支持新字段，提升系统的稳定性和用户体验。

miniprogram/pages/referral/referral.js

@@ -32,6 +32,7 @@ Page({
     pendingEarnings: 0,   // 待结算收益（保留兼容）
     shareRate: 90,        // 分成比例（90%）
     minWithdrawAmount: 10, // 最低提现金额（从后端获取）
+    hasWechatId: false,    // 是否已绑定微信号（未绑定时需引导去设置）
     
     // === 统计数据 ===
     referralCount: 0,     // 总推荐人数
@@ -68,6 +69,9 @@ Page({
   },
 
   onShow() {
+    // 从设置页返回时同步微信号绑定状态，便于提现按钮立即更新
+    const hasWechatId = !!(app.globalData.userInfo?.wechat || app.globalData.userInfo?.wechatId || wx.getStorageSync('user_wechat'))
+    this.setData({ hasWechatId })
     this.initData()
   },
 
@@ -152,11 +156,11 @@ Page({
         return typeof num === 'number' ? num.toFixed(2) : '0.00'
       }
       
-      // ✅ 修正：可提现金额 = 累计佣金 - 已提现金额 - 待审核金额
+      // ✅ 可提现金额 = 累计佣金 - 已提现金额 - 待审核金额，且不低于 0（防止数据不同步时出现负数）
       const totalCommissionNum = realData?.totalCommission || 0
       const withdrawnNum = realData?.withdrawnEarnings || 0
       const pendingWithdrawNum = realData?.pendingWithdrawAmount || 0
-      const availableEarningsNum = totalCommissionNum - withdrawnNum - pendingWithdrawNum
+      const availableEarningsNum = Math.max(0, totalCommissionNum - withdrawnNum - pendingWithdrawNum)
       const minWithdrawAmount = realData?.minWithdrawAmount || 10
       
       console.log('=== [Referral] 收益计算（完整版）===')
@@ -168,9 +172,11 @@ Page({
       console.log('按钮判断:', availableEarningsNum, '>=', minWithdrawAmount, '=', availableEarningsNum >= minWithdrawAmount)
       console.log('✅ 按钮应该:', availableEarningsNum >= minWithdrawAmount ? '🟢 启用(绿色)' : '⚫ 禁用(灰色)')
       
+      const hasWechatId = !!(userInfo?.wechat || userInfo?.wechatId || wx.getStorageSync('user_wechat'))
       this.setData({
         isLoggedIn: true,
         userInfo,
+        hasWechatId,
         
         // 核心可见数据
         bindingCount,
@@ -610,31 +616,33 @@ Page({
 
   // 提现 - 直接到微信零钱
   async handleWithdraw() {
-    // 使用数字版本直接进行判断，避免重复转换
     const availableEarnings = this.data.availableEarningsNum || 0
     const minWithdrawAmount = this.data.minWithdrawAmount || 10
-    
-    console.log('[Withdraw] 提现检查:', {
-      availableEarnings,
-      minWithdrawAmount,
-      shouldEnable: availableEarnings >= minWithdrawAmount
-    })
+    const hasWechatId = this.data.hasWechatId
     
     if (availableEarnings <= 0) {
       wx.showToast({ title: '暂无可提现收益', icon: 'none' })
       return
     }
-    
-    // 检查是否达到最低提现金额
     if (availableEarnings < minWithdrawAmount) {
-      wx.showToast({ 
-        title: `满${minWithdrawAmount}元可提现`, 
-        icon: 'none' 
+      wx.showToast({ title: `满${minWithdrawAmount}元可提现`, icon: 'none' })
+      return
+    }
+    
+    // 未绑定微信号时引导去设置
+    if (!hasWechatId) {
+      wx.showModal({
+        title: '请先绑定微信号',
+        content: '提现需先绑定微信号，便于到账核对。请到「设置」中绑定后再提现。',
+        confirmText: '去绑定',
+        cancelText: '取消',
+        success: (res) => {
+          if (res.confirm) wx.navigateTo({ url: '/pages/settings/settings' })
+        }
       })
       return
     }
     
-    // 确认提现
     wx.showModal({
       title: '确认提现',
       content: `将提现 ¥${availableEarnings.toFixed(2)} 到您的微信零钱`,
@@ -677,15 +685,13 @@ Page({
         // 刷新数据（此时待审核金额会增加，可提现金额会减少）
         this.initData()
       } else {
-        if (res.needBind) {
+        if (res.needBind || res.needBindWechat) {
           wx.showModal({
-            title: '需要绑定微信',
-            content: '请先在设置中绑定微信账号后再提现',
+            title: res.needBindWechat ? '请先绑定微信号' : '需要绑定微信',
+            content: res.needBindWechat ? '请到「设置」中绑定微信号后再提现，便于到账核对。' : '请先在设置中绑定微信账号后再提现',
             confirmText: '去绑定',
             success: (modalRes) => {
-              if (modalRes.confirm) {
-                wx.navigateTo({ url: '/pages/settings/settings' })
-              }
+              if (modalRes.confirm) wx.navigateTo({ url: '/pages/settings/settings' })
             }
           })
         } else {