부가서비스: 계좌명 인증 상태 표시 및 날짜 선택기 개선

- AccountHolderAuth에서 transferStatus 기반 성공/실패 표시 추가
- SingleDatePicker 컴포넌트 생성 및 링크결제 Step1에 적용
- 각 리스트 아이템에 key prop 추가로 React 경고 해결

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/pages/additional-service/additional-service-pages.tsx

@@ -56,7 +56,10 @@ export const AdditionalServicePages = () => {
           <Route path={ROUTE_NAMES.additionalService.accountHolderSearch.detail} element={<AccountHolderSearchDetailPage />} />
           <Route path={ROUTE_NAMES.additionalService.accountHolderSearch.request} element={<AccountHolderSearchRequestPage />} />
         </Route>
-        <Route path={ROUTE_NAMES.additionalService.accountHolderAuth} element={<AccountHolderAuthPage />} />
+        <Route path={ROUTE_NAMES.additionalService.accountHolderAuth.base}>
+          <Route path={ROUTE_NAMES.additionalService.accountHolderAuth.list} element={<AccountHolderAuthPage/>} />
+          <Route path={ROUTE_NAMES.additionalService.accountHolderAuth.detail} element={<AccountHolderSearchDetailPage />} />
+        </Route>
         <Route path={ROUTE_NAMES.additionalService.linkPayment.base}>
           <Route path={ROUTE_NAMES.additionalService.linkPayment.shippingHistory} element={<LinkPaymentHistoryPage />} />
           <Route path={ROUTE_NAMES.additionalService.linkPayment.pendingSend} element={<LinkPaymentWaitSendPage />} />