Add common translation keys and localize account holder search request page

- Add common translation keys: select, requestSuccess, requestFailed, errorOccurred
- Replace hardcoded '선택' with t('common.select') in account holder search request page
- Fix KeyIn enum: uncomment FULL_CANCEL and PARTIAL_CANCEL to resolve TypeScript errors
- 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/locales/en.json

@@ -43,6 +43,10 @@
         "failed": "Failed",
         "clear": "Clear",
         "result": "Result",
+        "select": "Select",
+        "requestSuccess": "Request successful",
+        "requestFailed": "Request failed",
+        "errorOccurred": "An error occurred",
         "currency": {
             "krw": "KRW"
         }

src/locales/ko.json

@@ -43,6 +43,10 @@
         "failed": "실패",
         "clear": "지우기",
         "result": "결과",
+        "select": "선택",
+        "requestSuccess": "요청 성공",
+        "requestFailed": "요청 실패",
+        "errorOccurred": "오류가 발생했습니다",
         "currency": {
             "krw": "원"
         }