feat: 分销规则完善 + 微信支付修复

1. 分销规则：
   - 链接带ID绑定推荐关系
   - 一级分销 + 30天有效期
   - 客户抢夺机制（过期可被抢走）
   - 90%收益归分发者

2. 新增统计数据：
   - 绑定用户数
   - 链接进入人数
   - 带来付款人数

3. 微信支付：
   - 添加点击反馈
   - 优化支付流程日志
   - 改善错误提示

4. 分销中心UI优化

app/api/miniprogram/pay/notify/route.ts

@@ -1,10 +1,15 @@
 /**
  * 小程序支付回调通知处理
  * 微信支付成功后会调用此接口
+ * 
+ * 分销规则：
+ * - 约90%给分发者（可在system_config配置）
+ * - 一级分销，只算直接推荐人
  */
 
 import { NextResponse } from 'next/server'
 import crypto from 'crypto'
+import { query, getConfig } from '@/lib/db'
 
 const WECHAT_PAY_CONFIG = {
   appId: 'wxb8bbb2b10dec74aa',
@@ -12,6 +17,9 @@ const WECHAT_PAY_CONFIG = {
   mchKey: 'wx3e31b068be59ddc131b068be59ddc2',
 }
 
+// 默认分成比例（90%给推广者）
+const DEFAULT_DISTRIBUTOR_SHARE = 0.9
+
 // 生成签名
 function generateSign(params: Record<string, string>, key: string): string {
   const sortedKeys = Object.keys(params).sort()
@@ -94,6 +102,7 @@ export async function POST(request: Request) {
     const orderSn = data.out_trade_no
     const transactionId = data.transaction_id
     const totalFee = parseInt(data.total_fee || '0', 10)
+    const totalAmount = totalFee / 100 // 转为元
     const openId = data.openid
 
     console.log('[PayNotify] 支付成功:', {
@@ -115,16 +124,65 @@ export async function POST(request: Request) {
 
     const { productType, productId, userId } = attach
 
-    // TODO: 这里应该更新数据库中的订单状态
     // 1. 更新订单状态为已支付
-    // 2. 如果是章节购买，将章节添加到用户已购列表
-    // 3. 如果是全书购买，更新用户为全书用户
+    try {
+      await query(`
+        UPDATE orders 
+        SET status = 'paid', 
+            transaction_id = ?,
+            pay_time = CURRENT_TIMESTAMP
+        WHERE order_sn = ? AND status = 'pending'
+      `, [transactionId, orderSn])
+      console.log('[PayNotify] 订单状态已更新:', orderSn)
+    } catch (e) {
+      console.error('[PayNotify] 更新订单状态失败:', e)
+    }
+
+    // 2. 获取用户信息
+    let buyerUserId = userId
+    if (!buyerUserId && openId) {
+      try {
+        const users = await query('SELECT id FROM users WHERE open_id = ?', [openId]) as any[]
+        if (users.length > 0) {
+          buyerUserId = users[0].id
+        }
+      } catch (e) {
+        console.error('[PayNotify] 获取用户信息失败:', e)
+      }
+    }
+
+    // 3. 更新用户购买记录
+    if (buyerUserId) {
+      try {
+        if (productType === 'fullbook') {
+          // 全书购买
+          await query('UPDATE users SET has_full_book = TRUE WHERE id = ?', [buyerUserId])
+          console.log('[PayNotify] 用户已购全书:', buyerUserId)
+        } else if (productType === 'section' && productId) {
+          // 单章购买
+          await query(`
+            UPDATE users 
+            SET purchased_sections = JSON_ARRAY_APPEND(
+              COALESCE(purchased_sections, '[]'), 
+              '$', ?
+            ) 
+            WHERE id = ? AND NOT JSON_CONTAINS(COALESCE(purchased_sections, '[]'), ?)
+          `, [productId, buyerUserId, JSON.stringify(productId)])
+          console.log('[PayNotify] 用户已购章节:', buyerUserId, productId)
+        }
+      } catch (e) {
+        console.error('[PayNotify] 更新用户购买记录失败:', e)
+      }
+
+      // 4. 处理分销佣金（90%给推广者）
+      await processReferralCommission(buyerUserId, totalAmount, orderSn)
+    }
     
     console.log('[PayNotify] 订单处理完成:', {
       orderSn,
       productType,
       productId,
-      userId,
+      userId: buyerUserId,
     })
 
     // 返回成功响应给微信
@@ -139,3 +197,73 @@ export async function POST(request: Request) {
     })
   }
 }
+
+/**
+ * 处理分销佣金
+ * 规则：约90%给分发者（一级分销）
+ */
+async function processReferralCommission(buyerUserId: string, amount: number, orderSn: string) {
+  try {
+    // 获取分成配置
+    let distributorShare = DEFAULT_DISTRIBUTOR_SHARE
+    try {
+      const config = await getConfig('referral_config')
+      if (config?.distributorShare) {
+        distributorShare = config.distributorShare / 100
+      }
+    } catch (e) { /* 使用默认配置 */ }
+
+    // 查找有效的推广绑定关系
+    const bindings = await query(`
+      SELECT rb.id, rb.referrer_id, rb.referee_id, rb.expiry_date, rb.status
+      FROM referral_bindings rb
+      WHERE rb.referee_id = ? 
+        AND rb.status = 'active'
+        AND rb.expiry_date > NOW()
+      ORDER BY rb.binding_date DESC
+      LIMIT 1
+    `, [buyerUserId]) as any[]
+
+    if (bindings.length === 0) {
+      console.log('[PayNotify] 用户无有效推广绑定，跳过分佣:', buyerUserId)
+      return
+    }
+
+    const binding = bindings[0]
+    const referrerId = binding.referrer_id
+
+    // 计算佣金（90%）
+    const commission = Math.round(amount * distributorShare * 100) / 100
+    
+    console.log('[PayNotify] 处理分佣:', {
+      referrerId,
+      buyerUserId,
+      amount,
+      commission,
+      shareRate: `${distributorShare * 100}%`
+    })
+
+    // 更新推广者的待结算收益
+    await query(`
+      UPDATE users 
+      SET pending_earnings = pending_earnings + ?
+      WHERE id = ?
+    `, [commission, referrerId])
+
+    // 更新绑定记录状态为已转化
+    await query(`
+      UPDATE referral_bindings 
+      SET status = 'converted',
+          conversion_date = CURRENT_TIMESTAMP,
+          commission_amount = ?,
+          order_id = (SELECT id FROM orders WHERE order_sn = ? LIMIT 1)
+      WHERE id = ?
+    `, [commission, orderSn, binding.id])
+
+    console.log('[PayNotify] 分佣完成: 推广者', referrerId, '获得', commission, '元')
+
+  } catch (error) {
+    console.error('[PayNotify] 处理分佣失败:', error)
+    // 分佣失败不影响主流程
+  }
+}