Add i18n localization to support entity

- Add translation keys to support.qna namespace:
  - support.qna.registrationDate: QnA item registration date label
  - support.qna.status: QnA item status label

- Localize ui/qna-item.tsx:
  - Replace hardcoded "등록일" with translation key
  - Replace hardcoded "상태" with translation key

- Other support files (notice-item.tsx, faq-item.tsx) already localized

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

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

src/entities/support/ui/qna-item.tsx

@@ -48,8 +48,8 @@ export const SupportQnaItem = ({
         <div className="inq-line">
           <div className="inq-title-text">{ title }</div>
           <div className="inq-meta">
-            등록일<span>{ moment(requestDate).format('YYYY.MM.DD') }</span>
-            <span className="sai">ㅣ</span>상태 <span>[{t(`support.qna.statusCode.${statusCode}`)}]</span>
+            {t('support.qna.registrationDate')}<span>{ moment(requestDate).format('YYYY.MM.DD') }</span>
+            <span className="sai">ㅣ</span>{t('support.qna.status')} <span>[{t(`support.qna.statusCode.${statusCode}`)}]</span>
           </div>
           <span className={`dot ${(statusCode === '03')? 'blue': 'gray'}`}></span>
         </div>