feat(payment): 支付&付费菜单按参考主题重构并新增提现策略页

- 子菜单重组为知识付费/余额充值/VIP会员/创作分成/推广返佣/收款接口/提现策略
- 收款接口页 1:1 复刻 Zibll 双下拉结构，仅保留支付宝/微信/PayPal/Stripe/易支付
- 订单前缀/流水号前缀/提现单号前缀配置保留并移入收款接口页
- 知识付费/推广返佣按参考主题全字段复刻，余额充值并入充值卡配置
- 新增 tabbed/between_number/page_select 表单控件及后端 pages 搜索源
- 清理旧 SPA 组件、无消费者 REST 端点与废弃配置键（不写双路兼容）
- 更新存量契约测试至新 schema 文件

tests/widget-system/financial-flow-contract.test.cjs

@@ -15,7 +15,7 @@ test('financial flow and withdrawal numbers use the new-only schema', () => {
 })
 
 test('order settings expose strict flow and withdrawal prefixes', () => {
-  const schema = read('assets/admin/src/schema/sections/payment/order.js')
+  const schema = read('assets/admin/src/schema/sections/payment/gateway.js')
   const provider = read('src/Admin/SchemaProvider.php')
   assert.match(schema, /key:\s*'payment_flow_prefix'[^{\n]*sanitize_type:\s*'business_prefix'[^{\n]*default:\s*'AK'/)
   assert.match(schema, /key:\s*'payment_withdrawal_prefix'[^{\n]*sanitize_type:\s*'business_prefix'[^{\n]*default:\s*'TX'/)