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/shared/ui/menu/index.tsx

@@ -86,7 +86,7 @@ export const Menu = ({
         {title: 'KEY-IN 결제', path: PATHS.additionalService.keyInPayment.list},
         {title: 'SMS 결제 통보', path: PATHS.additionalService.smsPaymentNotification},
         {title: '계좌성명조회', path: PATHS.additionalService.accountHolderSearch.list},
-        {title: '계좌점유인증', path: PATHS.additionalService.accountHolderAuth},
+        {title: '계좌점유인증', path: PATHS.additionalService.accountHolderAuth.list},
         {title: '링크결제', path: PATHS.additionalService.linkPayment.shippingHistory},
         {title: '알림톡 결제통보', path: PATHS.additionalService.kakaoPaymentNotification.list},
         {title: '자금이체', path: PATHS.additionalService.fundTransfer.requestList},