fix: 单卡导入虚拟号改为可选，非空时保证全局唯一

pkg/utils/excel.go

@@ -7,8 +7,6 @@ import (
 	"strings"
 
 	"github.com/xuri/excelize/v2"
-
-	pkgerrors "github.com/break/junhong_cmp_fiber/pkg/errors"
 )
 
 // CardInfo 卡信息(ICCID + MSISDN + VirtualNo)
@@ -228,10 +226,6 @@ func parseCardRows(rows [][]string) (*CSVParseResult, error) {
 		}
 	}
 
-	if virtualNoCol == -1 {
-		return nil, pkgerrors.New(pkgerrors.CodeInvalidParam, "Excel 文件缺少 virtual_no 列，请使用最新模板")
-	}
-
 	startLine := 0
 	if headerSkipped {
 		startLine = 1
@@ -292,16 +286,6 @@ func parseCardRows(rows [][]string) (*CSVParseResult, error) {
 			continue
 		}
 
-		if virtualNo == "" {
-			result.ParseErrors = append(result.ParseErrors, CSVParseError{
-				Line:   lineNum,
-				ICCID:  iccid,
-				MSISDN: msisdn,
-				Reason: "虚拟号(virtual_no)不能为空",
-			})
-			continue
-		}
-
 		result.Cards = append(result.Cards, CardInfo{
 			ICCID:     iccid,
 			MSISDN:    msisdn,