fix: allow clearing user remark in basic info update

Co-authored-by: multica-agent <github@multica.ai>

internal/logic/admin/user/updateUserBasicInfoLogic.go

@@ -101,7 +101,11 @@ func (l *UpdateUserBasicInfoLogic) UpdateUserBasicInfo(req *types.UpdateUserBasi
 		}
 
 		if req.Commission != nil && *req.Commission != userInfo.Commission {
-			if isWithdrawalScene(req.Remark) {
+			remark := ""
+			if req.Remark != nil {
+				remark = *req.Remark
+			}
+			if isWithdrawalScene(remark) {
 				logWithdrawalGuard(l.Logger, userInfo.Id)
 				return errors.Wrapf(xerr.NewErrCode(xerr.InvalidAccess), "commission overwrite is blocked in withdrawal scene")
 			}
@@ -129,8 +133,8 @@ func (l *UpdateUserBasicInfoLogic) UpdateUserBasicInfo(req *types.UpdateUserBasi
 		if req.IsAdmin != nil {
 			userInfo.IsAdmin = req.IsAdmin
 		}
-		if req.Remark != "" {
-			userInfo.Remark = req.Remark
+		if req.Remark != nil {
+			userInfo.Remark = *req.Remark
 		}
 		if req.OnlyFirstPurchase != nil {
 			userInfo.OnlyFirstPurchase = req.OnlyFirstPurchase