修复设备套餐流量不同步的问题

internal/service/iot_card/service.go

@@ -35,7 +35,7 @@ type PollingCallback interface {
 // 用于在手动刷新流量后触发套餐扣减，避免循环依赖
 type DataDeductor interface {
 	// DeductDataUsage 按优先级扣减套餐流量
-	DeductDataUsage(ctx context.Context, carrierType string, carrierID uint, usageMB int64) error
+	DeductDataUsage(ctx context.Context, carrierType string, carrierID uint, usageMB float64) error
 }
 
 type Service struct {
@@ -279,6 +279,7 @@ func (s *Service) toStandaloneResponse(card *model.IotCard, shopMap map[uint]str
 		NetworkStatusName:     constants.GetNetworkStatusName(card.NetworkStatus),
 		DataUsageMB:           card.DataUsageMB,
 		CurrentMonthUsageMB:   card.CurrentMonthUsageMB,
+		LastGatewayReadingMB:  card.LastGatewayReadingMB,
 		CurrentMonthStartDate: card.CurrentMonthStartDate,
 		LastMonthTotalMB:      card.LastMonthTotalMB,
 		LastDataCheckAt:       card.LastDataCheckAt,
@@ -884,7 +885,7 @@ func (s *Service) RefreshCardDataFromGateway(ctx context.Context, iccid string)
 
 	// 有增量时触发套餐流量扣减
 	if flowIncrementMB > 0 && s.dataDeductor != nil {
-		if err := s.dataDeductor.DeductDataUsage(ctx, "iot_card", card.ID, int64(flowIncrementMB)); err != nil {
+		if err := s.dataDeductor.DeductDataUsage(ctx, constants.AssetTypeIotCard, card.ID, flowIncrementMB); err != nil {
 			s.logger.Warn("手动刷新：套餐流量扣减失败",
 				zap.Uint("card_id", card.ID),
 				zap.Float64("increment_mb", flowIncrementMB),