feat: Member에 레벨업 필요 경험치 저장 및 DTO 적용 (#116)

Author: jaegyun1011

backend/src/main/java/com/back/domain/member/dto/MemberDto.java

@@ -17,6 +17,7 @@ public record MemberDto(
         MemberGender gender,
         Integer level,
         Integer xp,
+        Integer xpReq,
         Integer money,
         String title,
         Map<ItemType, Integer> items
@@ -30,6 +31,7 @@ public MemberDto(Member member) {
                 member.getGender(),
                 member.getLevel(),
                 member.getXp(),
+                member.getXpReq(),
                 member.getMoney(),
                 member.getTitle() != null ? member.getTitle().getContent() : null,
                 buildItems(member)

backend/src/main/java/com/back/domain/member/entity/Member.java

@@ -32,6 +32,7 @@ public class Member extends BaseEntity {
     // *** 상태 정보 ***
     private int level = 1;
     private int xp = 0;
+    private int xpReq = 5000;
     private int money = 0;
 
     // *** 장착한 칭호/아이템 정보 ***