feat: 新增数据库迁移，重命名 device_no 为 virtual_no，新增 iot_card.virtual_no 和 package.virtual_ratio 字段

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

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

internal/task/iot_card_import.go

@@ -167,8 +167,9 @@ func (h *IotCardImportHandler) downloadAndParse(ctx context.Context, task *model
 	cards := make(model.CardListJSON, 0, len(parseResult.Cards))
 	for _, card := range parseResult.Cards {
 		cards = append(cards, model.CardItem{
-			ICCID:  card.ICCID,
-			MSISDN: card.MSISDN,
+			ICCID:     card.ICCID,
+			MSISDN:    card.MSISDN,
+			VirtualNo: card.VirtualNo,
 		})
 	}
 
@@ -210,15 +211,16 @@ func (h *IotCardImportHandler) getCardsFromTask(task *model.IotCardImportTask) [
 
 func (h *IotCardImportHandler) processBatch(ctx context.Context, task *model.IotCardImportTask, batch []model.CardItem, startLine int, result *importResult) {
 	type cardMeta struct {
-		line   int
-		msisdn string
+		line      int
+		msisdn    string
+		virtualNo string
 	}
 	validCards := make([]model.CardItem, 0)
 	cardMetaMap := make(map[string]cardMeta)
 
 	for i, card := range batch {
 		line := startLine + i
-		cardMetaMap[card.ICCID] = cardMeta{line: line, msisdn: card.MSISDN}
+		cardMetaMap[card.ICCID] = cardMeta{line: line, msisdn: card.MSISDN, virtualNo: card.VirtualNo}
 
 		validationResult := validator.ValidateICCID(card.ICCID, task.CarrierType)
 		if !validationResult.Valid {
@@ -282,12 +284,56 @@ func (h *IotCardImportHandler) processBatch(ctx context.Context, task *model.Iot
 		return
 	}
 
-	iotCards := make([]*model.IotCard, 0, len(newCards))
-	now := time.Now()
+	// 批量检查 virtual_no 唯一性
+	virtualNos := make([]string, 0)
 	for _, card := range newCards {
+		if card.VirtualNo != "" {
+			virtualNos = append(virtualNos, card.VirtualNo)
+		}
+	}
+	existingVirtualNos := make(map[string]bool)
+	if len(virtualNos) > 0 {
+		existingVirtualNos, err = h.iotCardStore.ExistsByVirtualNoBatch(ctx, virtualNos)
+		if err != nil {
+			h.logger.Error("批量检查 virtual_no 是否存在失败",
+				zap.Error(err),
+				zap.Int("batch_size", len(virtualNos)),
+			)
+		}
+	}
+	// 批内去重：记录本批次已分配的 virtual_no
+	batchUsedVirtualNos := make(map[string]bool)
+
+	finalCards := make([]model.CardItem, 0, len(newCards))
+	for _, card := range newCards {
+		meta := cardMetaMap[card.ICCID]
+		if card.VirtualNo != "" {
+			if existingVirtualNos[card.VirtualNo] || batchUsedVirtualNos[card.VirtualNo] {
+				result.failedItems = append(result.failedItems, model.ImportResultItem{
+					Line:   meta.line,
+					ICCID:  card.ICCID,
+					MSISDN: meta.msisdn,
+					Reason: "virtual_no 已被占用: " + card.VirtualNo,
+				})
+				result.failCount++
+				continue
+			}
+			batchUsedVirtualNos[card.VirtualNo] = true
+		}
+		finalCards = append(finalCards, card)
+	}
+
+	if len(finalCards) == 0 {
+		return
+	}
+
+	iotCards := make([]*model.IotCard, 0, len(finalCards))
+	now := time.Now()
+	for _, card := range finalCards {
 		iotCard := &model.IotCard{
 			ICCID:            card.ICCID,
 			MSISDN:           card.MSISDN,
+			VirtualNo:        card.VirtualNo,
 			CarrierID:        task.CarrierID,
 			BatchNo:          task.BatchNo,
 			Status:           constants.IotCardStatusInStock,
@@ -308,7 +354,7 @@ func (h *IotCardImportHandler) processBatch(ctx context.Context, task *model.Iot
 			zap.Error(err),
 			zap.Int("batch_size", len(iotCards)),
 		)
-		for _, card := range newCards {
+		for _, card := range finalCards {
 			meta := cardMetaMap[card.ICCID]
 			result.failedItems = append(result.failedItems, model.ImportResultItem{
 				Line:   meta.line,
@@ -321,9 +367,8 @@ func (h *IotCardImportHandler) processBatch(ctx context.Context, task *model.Iot
 		return
 	}
 
-	result.successCount += len(newCards)
+	result.successCount += len(finalCards)
 
-	// 通知轮询系统：批量卡已创建
 	if h.pollingCallback != nil {
 		h.pollingCallback.OnBatchCardsCreated(ctx, iotCards)
 	}