fix: Table 어노테이션으로 복합 유니크 제약조건 추가 (#262)

layer-domain/src/main/java/org/layer/domain/member/entity/Member.java

@@ -13,6 +13,7 @@
 @Getter
 @Entity
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Table(uniqueConstraints = { @UniqueConstraint(columnNames = { "socialType", "socialId" }) })
 public class Member extends BaseTimeEntity {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)