add redirect_url at kakao_login

app/user/schemas/user_schema.py

@@ -163,6 +163,7 @@ class LoginResponse(BaseModel):
     token_type: str = Field(default="Bearer", description="토큰 타입")
     expires_in: int = Field(..., description="액세스 토큰 만료 시간 (초)")
     user: UserBriefResponse = Field(..., description="사용자 정보")
+    redirect_url: str = Field(..., description="로그인 후 리다이렉트할 프론트엔드 URL")
 
     model_config = {
         "json_schema_extra": {
@@ -177,7 +178,8 @@ class LoginResponse(BaseModel):
                     "email": "user@kakao.com",
                     "profile_image_url": "https://k.kakaocdn.net/dn/.../profile.jpg",
                     "is_new_user": False
-                }
+                },
+                "redirect_url": "http://localhost:3000"
             }
         }
     }

app/user/services/auth.py

@@ -111,6 +111,7 @@ class AuthService:
                 profile_image_url=user.profile_image_url,
                 is_new_user=is_new_user,
             ),
+            redirect_url="http://localhost:3000",
         )
 
     async def refresh_tokens(