chore: Java 스타일 수정

Author: github-actions

backend/src/main/java/io/f1/backend/domain/user/entity/User.java

@@ -10,8 +10,8 @@
 import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
 import jakarta.persistence.OneToOne;
-
 import jakarta.persistence.Table;
+
 import java.time.LocalDateTime;
 
 @Entity