Add localization for account holder auth and search detail pages

- Replace hardcoded Korean strings with translation keys in detail pages
- Add new translation keys for account holder services:
  - accountHolderAuth: title, detailTitle, requestDate, requestWay
  - accountHolderSearch: title, detailTitle
- Add 'result' key to common translations for reusability
- All labels now support Korean and English through i18n

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

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

src/pages/additional-service/account-holder-search/detail-page.tsx

@@ -27,7 +27,7 @@ export const AccountHolderSearchDetailPage = () => {
 
     const [detail, setDetail] = useState<ExtensionAccountHolderSearchDetailResponse>();
 
-    useSetHeaderTitle(t('additionalService.services.accountHolderSearch') + ' ' + t('common.detail'));
+    useSetHeaderTitle(t('additionalService.accountHolderSearch.detailTitle'));
     useSetHeaderType(HeaderType.LeftArrow);
     useSetFooterMode(false);
     useSetOnBack(() => {