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/service/recharge_order/service.go

@@ -5,6 +5,7 @@ import (
 	"strconv"
 	"time"
 
+	merchantpayment "github.com/break/junhong_cmp_fiber/internal/application/merchantpayment"
 	"github.com/break/junhong_cmp_fiber/internal/infrastructure/audit"
 	"github.com/break/junhong_cmp_fiber/internal/model"
 	"github.com/break/junhong_cmp_fiber/internal/store/postgres"
@@ -86,7 +87,8 @@ func (s *Service) HandlePaymentCallback(ctx context.Context, paymentNo string, p
 		return nil
 	}
 
-	if payment.Status != model.PaymentRecordStatusPending {
+	// 迟到首次成功必须允许 pending 与 failed 状态进入确认；冻结路由决定统计归属。
+	if payment.Status != model.PaymentRecordStatusPending && payment.Status != model.PaymentRecordStatusFailed {
 		return errors.New(errors.CodeInvalidStatus, "支付状态不允许处理")
 	}
 
@@ -102,7 +104,11 @@ func (s *Service) HandlePaymentCallback(ctx context.Context, paymentNo string, p
 
 	now := time.Now()
 	err = s.db.Transaction(func(tx *gorm.DB) error {
-		oldPaymentStatus := model.PaymentRecordStatusPending
+		// 乐观锁允许 pending 或 failed 首次进入 paid；重复成功由 RowsAffected/唯一事实保护。
+		oldPaymentStatus := payment.Status
+		if oldPaymentStatus != model.PaymentRecordStatusPending && oldPaymentStatus != model.PaymentRecordStatusFailed {
+			return errors.New(errors.CodeInvalidStatus, "支付状态不允许处理")
+		}
 		if err := s.paymentStore.UpdateStatusWithOptimisticLockDB(ctx, tx, payment.ID, &oldPaymentStatus, model.PaymentRecordStatusPaid, &now); err != nil {
 			if err == gorm.ErrRecordNotFound {
 				return nil
@@ -117,6 +123,10 @@ func (s *Service) HandlePaymentCallback(ctx context.Context, paymentNo string, p
 			return errors.Wrap(errors.CodeDatabaseError, err, "更新支付信息失败")
 		}
 
+		if err := merchantpayment.RecordFirstSuccess(ctx, tx, payment, now); err != nil {
+			return err
+		}
+
 		oldRechargeStatus := model.RechargeOrderStatusPending
 		if err := s.rechargeOrderStore.UpdateStatusWithOptimisticLockDB(ctx, tx, rechargeOrder.ID, &oldRechargeStatus, model.RechargeOrderStatusPaid, &now); err != nil {
 			if err == gorm.ErrRecordNotFound {