feat: Excel 导入按列位置读取，IoT 卡导入支持卡业务类型

- 重写 parseCardRows：移除列名识别，固定跳过第1行表头，按 col0=ICCID、
  col1=MSISDN、col2=VirtualNo 取值，VirtualNo 升级为必填字段
- 重写 ParseDeviceExcel：移除 buildDeviceColumnIndex，IMEI 调整至第5列
  新增 MaxSimSlots 范围校验 [1,4]，整行为空时不计入 total
- 删除 findCardColumns 和 buildDeviceColumnIndex 两个冗余函数
- ImportIotCardRequest 新增 card_category 字段（normal/industry，默认 normal）
- IotCardImportTask model 新增 card_category 字段
- 迁移 000111：tb_iot_card_import_task 新增 card_category 列
- CreateImportTask 将 req.CardCategory 写入任务，空串兜底 normal
- processBatch 改用 task.CardCategory 替代写死的 CardCategoryNormal
- ImportTaskResponse 新增 card_category 字段返回

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/model/dto/iot_card_dto.go

@@ -63,9 +63,10 @@ type ListStandaloneIotCardResponse struct {
 }
 
 type ImportIotCardRequest struct {
-	CarrierID uint   `json:"carrier_id" validate:"required,min=1" required:"true" minimum:"1" description:"运营商ID"`
-	BatchNo   string `json:"batch_no" validate:"omitempty,max=100" maxLength:"100" description:"批次号"`
-	FileKey   string `json:"file_key" validate:"required,min=1,max=500" required:"true" minLength:"1" maxLength:"500" description:"对象存储文件路径（通过 /storage/upload-url 获取）"`
+	CarrierID    uint   `json:"carrier_id" validate:"required,min=1" required:"true" minimum:"1" description:"运营商ID"`
+	BatchNo      string `json:"batch_no" validate:"omitempty,max=100" maxLength:"100" description:"批次号"`
+	FileKey      string `json:"file_key" validate:"required,min=1,max=500" required:"true" minLength:"1" maxLength:"500" description:"对象存储文件路径（通过 /storage/upload-url 获取）"`
+	CardCategory string `json:"card_category" validate:"omitempty,oneof=normal industry" description:"卡业务类型 (normal:普通卡, industry:行业卡)，默认 normal"`
 }
 
 type ImportIotCardResponse struct {
@@ -93,6 +94,7 @@ type ImportTaskResponse struct {
 	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)"`
 	CarrierName  string     `json:"carrier_name,omitempty" description:"运营商名称"`
 	BatchNo      string     `json:"batch_no,omitempty" description:"批次号"`
+	CardCategory string     `json:"card_category" description:"卡业务类型 (normal:普通卡, industry:行业卡)"`
 	FileName     string     `json:"file_name,omitempty" description:"文件名"`
 	TotalCount   int        `json:"total_count" description:"总数"`
 	SuccessCount int        `json:"success_count" description:"成功数"`

internal/model/iot_card_import_task.go

@@ -31,6 +31,7 @@ type IotCardImportTask struct {
 	CardList      CardListJSON      `gorm:"column:card_list;type:jsonb;comment:待导入卡列表[{iccid,msisdn}]" json:"-"`
 	StorageBucket string            `gorm:"column:storage_bucket;type:varchar(100);comment:对象存储桶名" json:"storage_bucket,omitempty"`
 	StorageKey    string            `gorm:"column:storage_key;type:varchar(500);comment:对象存储文件路径" json:"storage_key,omitempty"`
+	CardCategory  string            `gorm:"column:card_category;type:varchar(20);default:normal;not null;comment:卡业务类型(normal/industry)" json:"card_category"`
 }
 
 // CardItem 卡信息（ICCID + MSISDN + VirtualNo）

internal/service/iot_card_import/service.go

@@ -70,15 +70,21 @@ func (s *Service) CreateImportTask(ctx context.Context, req *dto.ImportIotCardRe
 	taskNo := s.importTaskStore.GenerateTaskNo(ctx)
 	fileName := filepath.Base(req.FileKey)
 
+	cardCategory := req.CardCategory
+	if cardCategory == "" {
+		cardCategory = constants.CardCategoryNormal
+	}
+
 	task := &model.IotCardImportTask{
-		TaskNo:      taskNo,
-		Status:      model.ImportTaskStatusPending,
-		CarrierID:   req.CarrierID,
-		CarrierType: carrier.CarrierType,
-		CarrierName: carrier.CarrierName,
-		BatchNo:     req.BatchNo,
-		FileName:    fileName,
-		StorageKey:  req.FileKey,
+		TaskNo:       taskNo,
+		Status:       model.ImportTaskStatusPending,
+		CarrierID:    req.CarrierID,
+		CarrierType:  carrier.CarrierType,
+		CarrierName:  carrier.CarrierName,
+		BatchNo:      req.BatchNo,
+		FileName:     fileName,
+		StorageKey:   req.FileKey,
+		CardCategory: cardCategory,
 	}
 	task.Creator = userID
 	task.Updater = userID
@@ -202,6 +208,7 @@ func (s *Service) toTaskResponse(task *model.IotCardImportTask) *dto.ImportTaskR
 		CarrierType:  task.CarrierType,
 		CarrierName:  task.CarrierName,
 		BatchNo:      task.BatchNo,
+		CardCategory: task.CardCategory,
 		FileName:     task.FileName,
 		TotalCount:   task.TotalCount,
 		SuccessCount: task.SuccessCount,

internal/task/iot_card_import.go

@@ -354,7 +354,7 @@ func (h *IotCardImportHandler) processBatch(ctx context.Context, task *model.Iot
 			CarrierName:      task.CarrierName,
 			BatchNo:          task.BatchNo,
 			Status:           constants.IotCardStatusInStock,
-			CardCategory:     constants.CardCategoryNormal,
+			CardCategory:     task.CardCategory,
 			ActivationStatus: constants.ActivationStatusInactive,
 			RealNameStatus:   constants.RealNameStatusNotVerified,
 			NetworkStatus:    constants.NetworkStatusOffline,