Merge pull request #9 from DearObjet/revert-8-fix/userDomain

Revert "[FIX] User 도메인 ID 값 원상복구"

Author: nickhealthy

src/main/java/app/dearobjet/backend/domain/user/entity/User.java

@@ -17,7 +17,7 @@ public class User extends BaseTimeEntity {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     @Column(name = "user_id")
-    private Long userId;
+    private Long id;
 
     @Column(unique = true)
     private String email;