-부가서비스 MID 기준 SelectBox 처리 (추후 수정 가능)

- SMS 재발송 API 수정

src/pages/additional-service/link-payment/apply/link-payment-apply-page.tsx

@@ -15,10 +15,19 @@ import moment from 'moment';
 
 export const LinkPaymentApplyPage = () => {
   const { navigate } = useNavigate();
+
+  const midOptionsWithoutGids = useStore.getState().UserStore.selectOptionsMidsWithoutGids;
   const userMid = useStore.getState().UserStore.mid;
+
+  // userMid가 midOptionsWithoutGids에 있으면 userMid 사용, 없으면 첫 번째 옵션 사용
+  let midItem = midOptionsWithoutGids.filter((value) => {
+    return value.value === userMid;
+  });
+  const initialMid = (midItem.length > 0) ? userMid : (midOptionsWithoutGids.length > 0 ? midOptionsWithoutGids[0]?.value || '' : '');
+
   const [processStep, setProcessStep] = useState<ProcessStep>(ProcessStep.One);
   const [formData, setFormData] = useState<LinkPaymentFormData>({
-    mid: userMid,
+    mid: initialMid,
     sendMethod: LinkPaymentSendMethod.SMS,
     goodsName: '',
     amount: 0,