fix: IoT 卡列表补充 virtual_no 字段和查询过滤，修正设备/卡导入 API 文档描述

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

internal/service/iot_card/service.go

@@ -105,6 +105,9 @@ func (s *Service) ListStandalone(ctx context.Context, req *dto.ListStandaloneIot
 	if req.MSISDN != "" {
 		filters["msisdn"] = req.MSISDN
 	}
+	if req.VirtualNo != "" {
+		filters["virtual_no"] = req.VirtualNo
+	}
 	if req.BatchNo != "" {
 		filters["batch_no"] = req.BatchNo
 	}
@@ -238,6 +241,7 @@ func (s *Service) toStandaloneResponse(card *model.IotCard, shopMap map[uint]str
 	resp := &dto.StandaloneIotCardResponse{
 		ID:                    card.ID,
 		ICCID:                 card.ICCID,
+		VirtualNo:             card.VirtualNo,
 		CardCategory:          card.CardCategory,
 		CarrierID:             card.CarrierID,
 		CarrierType:           card.CarrierType,