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/book/all-chapters/route.ts

@@ -5,34 +5,33 @@ import { query } from '@/lib/db'
 
 export async function GET() {
   try {
-    // 方案1: 优先从数据库读取章节数据
+    // 方案1: 优先从数据库读取（使用实际存在的 chapters 表，不是 sections）
     try {
       const dbChapters = await query(`
         SELECT 
-          id, section_id, title, section_title, content, 
-          is_free, price, words, section_order, chapter_order,
-          created_at, updated_at
-        FROM sections 
-        ORDER BY section_order ASC, chapter_order ASC
-      `) as any[]
+          id, part_id, part_title, chapter_id, chapter_title, section_title, content,
+          word_count, is_free, price, sort_order, created_at, updated_at
+        FROM chapters
+        WHERE status = 'published'
+        ORDER BY sort_order ASC
+      `, []) as any[]
       
       if (dbChapters && dbChapters.length > 0) {
-        console.log('[All Chapters API] 从数据库读取成功，共', dbChapters.length, '章')
+        console.log('[All Chapters API] 从数据库 chapters 表读取成功，共', dbChapters.length, '章')
         
-        // 格式化数据
-        const allChapters = dbChapters.map((chapter: any) => ({
-          id: chapter.id,
-          sectionId: chapter.section_id,
-          title: chapter.title,
-          sectionTitle: chapter.section_title,
-          content: chapter.content,
-          isFree: !!chapter.is_free,
-          price: chapter.price || 0,
-          words: chapter.words || Math.floor(Math.random() * 3000) + 2000,
-          sectionOrder: chapter.section_order,
-          chapterOrder: chapter.chapter_order,
-          createdAt: chapter.created_at,
-          updatedAt: chapter.updated_at
+        const allChapters = dbChapters.map((row: any, idx: number) => ({
+          id: row.id,
+          sectionId: row.chapter_id || row.part_id,
+          title: row.chapter_title || row.section_title,
+          sectionTitle: row.part_title || row.section_title,
+          content: row.content,
+          isFree: !!row.is_free,
+          price: Number(row.price) || 0,
+          words: row.word_count || Math.floor(Math.random() * 3000) + 2000,
+          sectionOrder: row.sort_order ?? idx + 1,
+          chapterOrder: idx + 1,
+          createdAt: row.created_at,
+          updatedAt: row.updated_at
         }))
         
         return NextResponse.json({