feat: added custom 429 status handler

pages/api/_custom/429.ts

@@ -0,0 +1,9 @@
+import ResponseWrapper from '@utils/ResponseWrapper'
+import { NextApiHandler, NextApiRequest, NextApiResponse } from 'next'
+
+const RateLimit: NextApiHandler = (_req: NextApiRequest, res: NextApiResponse) => {
+	res.statusCode = 429
+	return ResponseWrapper(res, { code: 429, message: '지정된 시간에 너무 많은 요청을 보냈습니다. 잠시 뒤에 시도해주세요.' })
+}
+
+export default RateLimit