refactor: 마이페이지 조회 null 값 포함 반환

Author: shinminkyoung1

src/main/java/com/weve/dto/response/MypageResponse.java

@@ -16,7 +16,7 @@
 @Builder
 @NoArgsConstructor
 @AllArgsConstructor
-@JsonInclude(JsonInclude.Include.NON_NULL)
+@JsonInclude(JsonInclude.Include.ALWAYS)  // null 값 같이 반환
 public class MypageResponse {
     private String name;
     private String nationality;