fix: 프런트 요청으로 로그인 후 리다이렉트 url 수정

Author: hyeunS-P

src/main/java/grep/neogulcoder/global/auth/oauth/OAuthSuccessHandler.java

@@ -45,7 +45,7 @@ public void onAuthenticationSuccess(HttpServletRequest request, HttpServletRespo
 
         response.addHeader("Set-Cookie", accessTokenCookie.toString());
         response.addHeader("Set-Cookie", refreshTokenCookie.toString());
-        getRedirectStrategy().sendRedirect(request, response, "http://localhost:3000/");
+        getRedirectStrategy().sendRedirect(request, response, "http://localhost:3000/auth/callback");
     }
 
 }