hotfix: onboarding step 5 token 발급 api 인터페이스 수정

Author: Choi-Jiwon-38

frontend/src/app/onboarding/step5/page.tsx

@@ -22,14 +22,16 @@ export default function Step3() {
   const socialId = searchParam.get('social_id');
   const router = useRouter();
 
+  const isDevMode = typeof window !== 'undefined' && window.location.hostname !== 'workinkorea.info';
+
   const handleNextClick = async () => {
     try {
       await createUserInterest({
         social_id: socialId,
         interests: selectedOptions,
       });
       const data = await PublicAxiosInstance.get(
-        `/auth/token?social_id=${socialId}`,
+        `/auth/token?social_id=${socialId}&is_dev_mode=${isDevMode}`,
       );
       const redirectUrl = data.data.redirect_url;
       router.push(redirectUrl);