实现支付商户池与微信授权配置

新增收款商户、商户池轮询、微信授权配置独立管理；三类新支付
（C端套餐购买、C端资产钱包充值、代理在线预存款充值）无条件
经商户池选择并冻结路由，无旧综合配置回退。merchant_id 为空
历史支付继续按 payment_config_id 双读。凭证版本化加载与
ID+版本缓存保证轮换一致性。删除商户池新支付创建开关及全部
引用。

internal/bootstrap/services.go

@@ -9,6 +9,7 @@ import (
 	approvalApp "github.com/break/junhong_cmp_fiber/internal/application/approval"
 	cardObservationApp "github.com/break/junhong_cmp_fiber/internal/application/cardobservation"
 	exchangeApp "github.com/break/junhong_cmp_fiber/internal/application/exchange"
+	merchantpayment "github.com/break/junhong_cmp_fiber/internal/application/merchantpayment"
 	refundapprovalApp "github.com/break/junhong_cmp_fiber/internal/application/refundapproval"
 	walletapp "github.com/break/junhong_cmp_fiber/internal/application/wallet"
 	approvalInfra "github.com/break/junhong_cmp_fiber/internal/infrastructure/approval"
@@ -286,6 +287,7 @@ func initServices(s *stores, deps *Dependencies) *services {
 	paymentIntegration := integrationlog.NewRepository(deps.DB)
 	agentRechargeOnline := agentrechargeApp.NewOnlineCreationService(
 		deps.DB,
+		merchantpayment.NewRuntimeLoader(deps.DB, deps.Redis),
 		paymentInfra.NewWechatWebAdapter(wechat.NewRedisCache(deps.Redis), paymentIntegration, deps.Logger),
 		paymentInfra.NewAlipayWapAdapter(paymentIntegration, deps.Logger),
 		paymentInfra.NewFuiouScanAdapter(paymentIntegration, deps.Logger),
@@ -313,6 +315,7 @@ func initServices(s *stores, deps *Dependencies) *services {
 	)
 	refundService.SetAgentWalletRefundService(walletapp.NewRefundService(walletinfra.NewRefundEventWriter(walletOutbox), nil))
 	refundService.SetNotificationOutbox(walletOutbox)
+	refundService.SetPaymentMerchantRuntime(merchantpayment.NewRuntimeLoader(deps.DB, deps.Redis))
 	refundService.SetLifecycleAudit(auditWriter)
 	exchangeService := exchangeSvc.New(deps.DB, s.ExchangeOrder, s.IotCard, s.Device, s.AssetWallet, s.AssetWalletTransaction, s.PackageUsage, s.PackageUsageDailyRecord, s.ResourceTag, customerBinding, deps.Logger)
 	exchangeService.SetShippingCreatedNotifier(exchangeApp.NewShippingCreatedNotifier(exchangeInfra.NewShippingNotificationWriter(outbox.NewRepository())))