Refactor/oauth (#209)

* api redirect 주소 변경

* Revert "api redirect 주소 변경"

This reverts commit a34c645.

* refactor : redirect 주소 재변경

---------

Co-authored-by: Lim Minjee <limminjee@Limui-MacBookAir.local>

Author: minjee2758

src/main/java/org/ezcode/codetest/presentation/usermanagement/OAuth2Controller.java

@@ -47,7 +47,7 @@ public void redirectToProvider(
 
         String target = UriComponentsBuilder.newInstance()
             .scheme("https")
-            .host("ezcode.my")
+            .host("api.ezcode.my")
             .path("/oauth2/authorization/" + provider)
             .build()
             .toUriString();