v1.19 全面改版：VIP会员系统、我的收益、创业老板排行、阅读量排序

- 后端: users表新增VIP字段, 4个VIP API (purchase/status/profile/members)
- 后端: hot接口改按user_tracks阅读量排序
- 后端: orders表支持vip产品类型, migrate新增vip_fields迁移
- 小程序「我的」: 推广中心改为我的收益, 头像VIP标识, VIP入口卡片
- 小程序「我的」: 最近阅读显示真实章节名称
- 小程序首页: 去掉内容概览, 新增创业老板排行(4列网格)
- 小程序首页: 精选推荐从hot接口获取, goToRead增加track记录
- 新增页面: VIP详情页, 会员详情页
- 开发文档精简为10个标准目录, 创建SKILL.md, 需求日志规范化

Co-authored-by: Cursor <cursoragent@cursor.com>

app/api/vip/purchase/route.ts

@@ -0,0 +1,57 @@
+/**
+ * VIP会员购买 - 创建VIP订单
+ */
+import { NextRequest, NextResponse } from 'next/server'
+import { query, getConfig } from '@/lib/db'
+
+export async function POST(request: NextRequest) {
+  try {
+    const { userId } = await request.json()
+    if (!userId) {
+      return NextResponse.json({ success: false, error: '缺少userId' }, { status: 400 })
+    }
+
+    const users = await query(
+      'SELECT id, open_id, is_vip, vip_expire_date FROM users WHERE id = ?',
+      [userId]
+    ) as any[]
+    if (!users.length) {
+      return NextResponse.json({ success: false, error: '用户不存在' }, { status: 404 })
+    }
+    const user = users[0]
+
+    // 如果已经是VIP且未过期
+    if (user.is_vip && user.vip_expire_date && new Date(user.vip_expire_date) > new Date()) {
+      return NextResponse.json({ success: false, error: '当前已是VIP会员' }, { status: 400 })
+    }
+
+    let vipPrice = 1980
+    try {
+      const config = await getConfig('vip_price')
+      if (config) vipPrice = Number(config) || 1980
+    } catch { /* 默认 */ }
+
+    const orderId = 'vip_' + Date.now().toString(36) + Math.random().toString(36).substr(2, 6)
+    const orderSn = 'VIP' + Date.now() + Math.floor(Math.random() * 1000)
+
+    await query(
+      `INSERT INTO orders (id, order_sn, user_id, open_id, product_type, amount, description, status)
+       VALUES (?, ?, ?, ?, 'vip', ?, 'VIP年度会员', 'created')`,
+      [orderId, orderSn, userId, user.open_id || '', vipPrice]
+    )
+
+    return NextResponse.json({
+      success: true,
+      data: {
+        orderId,
+        orderSn,
+        amount: vipPrice,
+        productType: 'vip',
+        description: 'VIP年度会员（365天）'
+      }
+    })
+  } catch (error) {
+    console.error('[VIP Purchase]', error)
+    return NextResponse.json({ success: false, error: '创建订单失败' }, { status: 500 })
+  }
+}