refactor: 常量化订单状态 + 支付渠道/提供商分离显示 + H5自动跳转

- 新增 src/lib/constants.ts，集中管理 ORDER_STATUS / PAYMENT_TYPE / PAYMENT_PREFIX 等常量
- 后端 service/status/timeout/limits 全量替换魔法字符串为 ORDER_STATUS.*
- PaymentTypeMeta 新增 provider 字段，分离 sublabel（选择器展示）与 provider（提供商名称）
- getPaymentDisplayInfo() 返回 { channel, provider } 用于用户端/管理端展示
- 支持通过 PAYMENT_SUBLABEL_* 环境变量覆盖默认 sublabel
- PaymentQRCode: H5 支付自动跳转（含易支付微信 weixin:// scheme 兜底）
- 订单列表/详情页：显示可读的渠道名+提供商，不再暴露内部标识符

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/lib/order/status.ts

@@ -1,3 +1,5 @@
+import { ORDER_STATUS, REFUND_STATUSES } from '@/lib/constants';
+
 export type RechargeStatus = 'not_paid' | 'paid_pending' | 'recharging' | 'success' | 'failed' | 'closed';
 
 export interface OrderStatusLike {
@@ -6,9 +8,13 @@ export interface OrderStatusLike {
   completedAt?: Date | string | null;
 }
 
-const CLOSED_STATUSES = new Set(['EXPIRED', 'CANCELLED', 'REFUNDING', 'REFUNDED', 'REFUND_FAILED']);
-
-const REFUND_STATUSES = new Set(['REFUNDING', 'REFUNDED', 'REFUND_FAILED']);
+const CLOSED_STATUSES = new Set<string>([
+  ORDER_STATUS.EXPIRED,
+  ORDER_STATUS.CANCELLED,
+  ORDER_STATUS.REFUNDING,
+  ORDER_STATUS.REFUNDED,
+  ORDER_STATUS.REFUND_FAILED,
+]);
 
 function hasDate(value: Date | string | null | undefined): boolean {
   return Boolean(value);
@@ -19,7 +25,7 @@ export function isRefundStatus(status: string): boolean {
 }
 
 export function isRechargeRetryable(order: OrderStatusLike): boolean {
-  return hasDate(order.paidAt) && order.status === 'FAILED' && !isRefundStatus(order.status);
+  return hasDate(order.paidAt) && order.status === ORDER_STATUS.FAILED && !isRefundStatus(order.status);
 }
 
 export function deriveOrderState(order: OrderStatusLike): {
@@ -28,17 +34,17 @@ export function deriveOrderState(order: OrderStatusLike): {
   rechargeStatus: RechargeStatus;
 } {
   const paymentSuccess = hasDate(order.paidAt);
-  const rechargeSuccess = hasDate(order.completedAt) || order.status === 'COMPLETED';
+  const rechargeSuccess = hasDate(order.completedAt) || order.status === ORDER_STATUS.COMPLETED;
 
   if (rechargeSuccess) {
     return { paymentSuccess, rechargeSuccess: true, rechargeStatus: 'success' };
   }
 
-  if (order.status === 'RECHARGING') {
+  if (order.status === ORDER_STATUS.RECHARGING) {
     return { paymentSuccess, rechargeSuccess: false, rechargeStatus: 'recharging' };
   }
 
-  if (order.status === 'FAILED') {
+  if (order.status === ORDER_STATUS.FAILED) {
     return { paymentSuccess, rechargeSuccess: false, rechargeStatus: 'failed' };
   }