feat: 콜백 전체 URL 추가

Author: HoonDongKang

frontend/src/pages/loginPage/api/loginWithGithub.ts

@@ -9,7 +9,7 @@ export async function loginWithGitHub(): Promise<void> {
     });
 
     if (response.type === 'opaqueredirect' || response.ok || (response.status >= 300 && response.status < 400)) {
-      window.location.href = '/api/auth/github';
+      window.location.href = `${import.meta.env.VITE_API_URL}/api/auth/github`;
     } else {
       throw new Error('서버 응답이 올바르지 않습니다.');
     }

frontend/src/pages/loginPage/api/loginWithKakao.ts

@@ -9,7 +9,7 @@ export async function loginWithKakao(): Promise<void> {
     });
 
     if (response.type === 'opaqueredirect' || response.ok || (response.status >= 300 && response.status < 400)) {
-      window.location.href = '/api/auth/kakao';
+      window.location.href = `${import.meta.env.VITE_API_URL}/api/auth/kakao`;
     } else {
       throw new Error('서버 응답이 올바르지 않습니다.');
     }