feat: 完整重构小程序匹配功能 + 修复UI对齐 + 文章数据API

主要更新:
1. 按H5网页端完全重构匹配功能(match页面)
   - 4种匹配类型: 创业合伙/资源对接/导师顾问/团队招募
   - 资源对接等类型弹出手机号/微信号输入框
   - 去掉重新匹配按钮，改为返回按钮

2. 修复所有卡片对齐和宽度问题
   - 目录页附录卡片居中
   - 首页阅读进度卡片满宽度
   - 我的页面菜单卡片对齐
   - 推广中心分享卡片统一宽度

3. 修复目录页图标和文字对齐
   - section-icon固定40rpx宽高
   - section-title与图标垂直居中

4. 更新真实完整文章标题(62篇)
   - 从book目录读取真实markdown文件名
   - 替换之前的简化标题

5. 新增文章数据API
   - /api/db/chapters - 获取完整书籍结构
   - 支持按ID获取单篇文章内容

app/api/db/purchases/route.ts

@@ -0,0 +1,106 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { purchaseDB, userDB, distributionDB } from '@/lib/db'
+
+// 获取购买记录
+export async function GET(req: NextRequest) {
+  try {
+    const { searchParams } = new URL(req.url)
+    const userId = searchParams.get('user_id')
+
+    if (userId) {
+      const purchases = await purchaseDB.getByUserId(userId)
+      return NextResponse.json({ success: true, purchases })
+    }
+
+    const purchases = await purchaseDB.getAll()
+    return NextResponse.json({ success: true, purchases })
+  } catch (error: any) {
+    console.error('Get purchases error:', error)
+    return NextResponse.json({ 
+      success: false, 
+      error: error.message 
+    }, { status: 500 })
+  }
+}
+
+// 创建购买记录
+export async function POST(req: NextRequest) {
+  try {
+    const body = await req.json()
+    const { 
+      user_id, 
+      type, 
+      section_id, 
+      section_title, 
+      amount, 
+      payment_method,
+      referral_code 
+    } = body
+
+    // 创建购买记录
+    const purchase = await purchaseDB.create({
+      id: `purchase_${Date.now()}`,
+      user_id,
+      type,
+      section_id,
+      section_title,
+      amount,
+      payment_method,
+      referral_code,
+      referrer_earnings: 0,
+      status: 'completed'
+    })
+
+    // 更新用户购买状态
+    if (type === 'fullbook') {
+      await userDB.update(user_id, { has_full_book: true })
+    }
+
+    // 处理分销佣金
+    if (referral_code) {
+      // 查找推荐人
+      const users = await userDB.getAll()
+      const referrer = users.find((u: any) => u.referral_code === referral_code)
+      
+      if (referrer) {
+        const commissionRate = 0.9 // 90% 佣金
+        const commissionAmount = amount * commissionRate
+
+        // 查找有效的绑定关系
+        const binding = await distributionDB.getActiveBindingByReferee(user_id)
+        
+        if (binding) {
+          // 创建佣金记录
+          await distributionDB.createCommission({
+            id: `commission_${Date.now()}`,
+            binding_id: binding.id,
+            referrer_id: referrer.id,
+            referee_id: user_id,
+            order_id: purchase.id,
+            amount,
+            commission_rate: commissionRate * 100,
+            commission_amount: commissionAmount,
+            status: 'pending'
+          })
+
+          // 更新推荐人收益
+          await userDB.update(referrer.id, {
+            earnings: (referrer.earnings || 0) + commissionAmount,
+            pending_earnings: (referrer.pending_earnings || 0) + commissionAmount
+          })
+
+          // 更新购买记录的推荐人收益
+          purchase.referrer_earnings = commissionAmount
+        }
+      }
+    }
+
+    return NextResponse.json({ success: true, purchase })
+  } catch (error: any) {
+    console.error('Create purchase error:', error)
+    return NextResponse.json({ 
+      success: false, 
+      error: error.message 
+    }, { status: 500 })
+  }
+}