feat: 完善后台管理+搜索功能+分销系统

主要更新：
- 后台菜单精简（9项→6项）
- 新增搜索功能（敏感信息过滤）
- 分销绑定和提现系统完善
- 数据库初始化API（自动修复表结构）
- 用户管理：显示绑定关系详情
- 小程序：上下章导航优化、匹配页面重构
- 修复hydration和数据类型问题

app/api/admin/withdrawals/route.ts

@@ -0,0 +1,169 @@
+/**
+ * 后台提现管理API
+ * 获取所有提现记录，处理提现审批
+ */
+import { NextResponse } from 'next/server'
+import { query } from '@/lib/db'
+
+// 获取所有提现记录
+export async function GET(request: Request) {
+  try {
+    const { searchParams } = new URL(request.url)
+    const status = searchParams.get('status') // pending, success, failed, all
+    
+    let sql = `
+      SELECT 
+        w.*,
+        u.nickname as user_nickname,
+        u.phone as user_phone,
+        u.avatar as user_avatar,
+        u.referral_code
+      FROM withdrawals w
+      LEFT JOIN users u ON w.user_id = u.id
+    `
+    
+    if (status && status !== 'all') {
+      sql += ` WHERE w.status = '${status}'`
+    }
+    
+    sql += ` ORDER BY w.created_at DESC LIMIT 100`
+    
+    const withdrawals = await query(sql) as any[]
+    
+    // 统计信息
+    const statsResult = await query(`
+      SELECT 
+        COUNT(*) as total,
+        SUM(CASE WHEN status = 'pending' THEN 1 ELSE 0 END) as pending_count,
+        SUM(CASE WHEN status = 'pending' THEN amount ELSE 0 END) as pending_amount,
+        SUM(CASE WHEN status = 'success' THEN 1 ELSE 0 END) as success_count,
+        SUM(CASE WHEN status = 'success' THEN amount ELSE 0 END) as success_amount,
+        SUM(CASE WHEN status = 'failed' THEN 1 ELSE 0 END) as failed_count
+      FROM withdrawals
+    `) as any[]
+    
+    const stats = statsResult[0] || {}
+    
+    return NextResponse.json({
+      success: true,
+      withdrawals: withdrawals.map(w => ({
+        id: w.id,
+        userId: w.user_id,
+        userNickname: w.user_nickname || '未知用户',
+        userPhone: w.user_phone,
+        userAvatar: w.user_avatar,
+        referralCode: w.referral_code,
+        amount: parseFloat(w.amount),
+        status: w.status,
+        wechatOpenid: w.wechat_openid,
+        transactionId: w.transaction_id,
+        errorMessage: w.error_message,
+        createdAt: w.created_at,
+        processedAt: w.processed_at
+      })),
+      stats: {
+        total: parseInt(stats.total) || 0,
+        pendingCount: parseInt(stats.pending_count) || 0,
+        pendingAmount: parseFloat(stats.pending_amount) || 0,
+        successCount: parseInt(stats.success_count) || 0,
+        successAmount: parseFloat(stats.success_amount) || 0,
+        failedCount: parseInt(stats.failed_count) || 0
+      }
+    })
+    
+  } catch (error) {
+    console.error('Get withdrawals error:', error)
+    return NextResponse.json({
+      success: false,
+      error: '获取提现记录失败'
+    }, { status: 500 })
+  }
+}
+
+// 处理提现（审批/拒绝）
+export async function PUT(request: Request) {
+  try {
+    const body = await request.json()
+    const { id, action, reason } = body // action: approve, reject
+    
+    if (!id || !action) {
+      return NextResponse.json({
+        success: false,
+        error: '缺少必要参数'
+      }, { status: 400 })
+    }
+    
+    // 获取提现记录
+    const withdrawals = await query('SELECT * FROM withdrawals WHERE id = ?', [id]) as any[]
+    if (withdrawals.length === 0) {
+      return NextResponse.json({
+        success: false,
+        error: '提现记录不存在'
+      }, { status: 404 })
+    }
+    
+    const withdrawal = withdrawals[0]
+    
+    if (withdrawal.status !== 'pending') {
+      return NextResponse.json({
+        success: false,
+        error: '该提现记录已处理'
+      }, { status: 400 })
+    }
+    
+    if (action === 'approve') {
+      // 批准提现 - 更新状态为成功
+      await query(`
+        UPDATE withdrawals 
+        SET status = 'success', processed_at = NOW(), transaction_id = ?
+        WHERE id = ?
+      `, [`manual_${Date.now()}`, id])
+      
+      // 更新用户已提现金额
+      await query(`
+        UPDATE users 
+        SET withdrawn_earnings = withdrawn_earnings + ?, 
+            pending_earnings = pending_earnings - ?
+        WHERE id = ?
+      `, [withdrawal.amount, withdrawal.amount, withdrawal.user_id])
+      
+      return NextResponse.json({
+        success: true,
+        message: '提现已批准'
+      })
+      
+    } else if (action === 'reject') {
+      // 拒绝提现 - 返还用户余额
+      await query(`
+        UPDATE withdrawals 
+        SET status = 'failed', processed_at = NOW(), error_message = ?
+        WHERE id = ?
+      `, [reason || '管理员拒绝', id])
+      
+      // 返还用户余额
+      await query(`
+        UPDATE users 
+        SET earnings = earnings + ?,
+            pending_earnings = pending_earnings - ?
+        WHERE id = ?
+      `, [withdrawal.amount, withdrawal.amount, withdrawal.user_id])
+      
+      return NextResponse.json({
+        success: true,
+        message: '提现已拒绝，余额已返还'
+      })
+    }
+    
+    return NextResponse.json({
+      success: false,
+      error: '无效的操作'
+    }, { status: 400 })
+    
+  } catch (error) {
+    console.error('Process withdrawal error:', error)
+    return NextResponse.json({
+      success: false,
+      error: '处理提现失败'
+    }, { status: 500 })
+  }
+}