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。

app/api/admin/chapters/route.ts

@@ -7,6 +7,7 @@ import { NextResponse } from 'next/server'
 import fs from 'fs'
 import path from 'path'
 import { requireAdminResponse } from '@/lib/admin-auth'
+import { query } from '@/lib/db'
 
 // 获取书籍目录
 const BOOK_DIR = path.join(process.cwd(), 'book')
@@ -286,27 +287,38 @@ export async function POST(request: Request) {
     console.log('[AdminChapters] 更新章节:', { action, chapterId })
 
     switch (action) {
-      case 'updatePrice':
-        // 更新章节价格
-        // TODO: 保存到数据库
+      case 'updatePrice': {
+        if (data?.price != null && chapterId) {
+          await query('UPDATE chapters SET price = ?, updated_at = NOW() WHERE id = ?', [Number(data.price), chapterId])
+        }
         return NextResponse.json({
           success: true,
-          data: { message: '价格更新成功', chapterId, price: data.price }
+          data: { message: '价格更新成功', chapterId, price: data?.price }
         })
+      }
 
-      case 'toggleFree':
-        // 切换免费状态
+      case 'toggleFree': {
+        if (data?.isFree != null && chapterId) {
+          await query('UPDATE chapters SET is_free = ?, updated_at = NOW() WHERE id = ?', [!!data.isFree, chapterId])
+        }
         return NextResponse.json({
           success: true,
-          data: { message: '免费状态更新成功', chapterId, isFree: data.isFree }
+          data: { message: '免费状态更新成功', chapterId, isFree: data?.isFree }
         })
+      }
 
-      case 'updateStatus':
-        // 更新发布状态
+      case 'updateStatus': {
+        if (data?.status && chapterId) {
+          const s = String(data.status)
+          if (['draft', 'published', 'archived'].includes(s)) {
+            await query('UPDATE chapters SET status = ?, updated_at = NOW() WHERE id = ?', [s, chapterId])
+          }
+        }
         return NextResponse.json({
           success: true,
-          data: { message: '发布状态更新成功', chapterId, status: data.status }
+          data: { message: '发布状态更新成功', chapterId, status: data?.status }
         })
+      }
 
       default:
         return NextResponse.json({