feat(v2): gateway.Refund 编排(部分/多次累计 + 超退守卫 + crypto 人工向闭环)+ RefundingProvider 加 refundID 幂等键

main.go

@@ -40,6 +40,7 @@ func main() {
 
 	// v2 统一网关装配(P2 骨架,P3 配置驱动注册接线):provider 注册表 + gateway + webhook notifier。
 	orderStore := store.NewOrderStore(db)
+	refundStore := store.NewRefundStore(db)
 	webhookStore := store.NewWebhookStore(db)
 	notifier := webhook.NewNotifier(webhookStore, config.C.BizByName, func(no string) (bool, error) {
 		o, err := orderStore.GetOrder(no) // 投递门禁:订单已结算(paid 及退款态)才放行
@@ -55,7 +56,7 @@ func main() {
 	// P5 多账户路由:按 config.routing.<channel> 选策略(缺省 round_robin)。
 	// limit_aware 用量数据源 P6 对账就绪前用空源(NopUsage,退化为 round_robin)。
 	acctPicker := accounts.NewRouter(acctReg, config.C.Routing, accounts.NopUsage{})
-	gw := gateway.New(orderStore, pReg, acctPicker, productResolver, notifier, "cn")
+	gw := gateway.New(orderStore, refundStore, pReg, acctPicker, productResolver, notifier, "cn")
 	router.SetupV2(r, gw)
 
 	if config.C.QuerySync.Enabled {