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/model/dto/iot_card_dto.go

@@ -11,6 +11,7 @@ type ListStandaloneIotCardRequest struct {
 	SeriesID      *uint  `json:"series_id" query:"series_id" description:"套餐系列ID"`
 	ICCID         string `json:"iccid" query:"iccid" validate:"omitempty,max=20" maxLength:"20" description:"ICCID(模糊查询)"`
 	MSISDN        string `json:"msisdn" query:"msisdn" validate:"omitempty,max=20" maxLength:"20" description:"卡接入号(模糊查询)"`
+	VirtualNo     string `json:"virtual_no" query:"virtual_no" validate:"omitempty,max=50" maxLength:"50" description:"虚拟号(模糊查询)"`
 	BatchNo       string `json:"batch_no" query:"batch_no" validate:"omitempty,max=100" maxLength:"100" description:"批次号"`
 	PackageID     *uint  `json:"package_id" query:"package_id" description:"套餐ID"`
 	IsDistributed *bool  `json:"is_distributed" query:"is_distributed" description:"是否已分销 (true:已分销, false:未分销)"`
@@ -22,6 +23,7 @@ type ListStandaloneIotCardRequest struct {
 type StandaloneIotCardResponse struct {
 	ID                    uint       `json:"id" description:"卡ID"`
 	ICCID                 string     `json:"iccid" description:"ICCID"`
+	VirtualNo             string     `json:"virtual_no,omitempty" description:"卡虚拟号（用于客服查找资产）"`
 	CardCategory          string     `json:"card_category" description:"卡业务类型 (normal:普通卡, industry:行业卡)"`
 	CarrierID             uint       `json:"carrier_id" description:"运营商ID"`
 	CarrierType           string     `json:"carrier_type,omitempty" description:"运营商类型 (CMCC:中国移动, CUCC:中国联通, CTCC:中国电信, CBN:中国广电)"`