"Remove unnecessary column annotations in Member entity"

The `@Column` annotations for `key` and `code` fields were redundant and have been removed. This cleanup simplifies the entity definition without affecting functionality.

Author: Ahn-JoonHun

spring-boot/src/main/java/com/mpc/springboot/member/domain/entity/Member.java

@@ -9,17 +9,14 @@
 
 @Getter
 @NoArgsConstructor
-//@Table(name = "member")
 @Entity
 public class Member {
 
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
-    @Column(name = "`key`")
     private Integer key;
 
     @Convert(converter = MemberCodeConverter.class)
-    @Column(name = "`code`")
     private MemberCode code;
 
     @Embedded