feat: 프로필 요청 DTO 추가

Author: MEOHIN

src/main/java/com/back/domain/profile/dto/ProfileResponseDto.java

@@ -0,0 +1,18 @@
+package com.back.domain.profile.dto;
+
+import lombok.Builder;
+import lombok.Getter;
+
+@Getter
+@Builder
+public class ProfileResponseDto {
+    private Long id;
+    private String nickname;
+    private String email;
+
+    // 서버에 저장된 실제 값(0~100)
+    private Double abvDegree;      // 83.2
+    // 표현용(서버에서 계산)
+    private Integer abvLevel;      // 1~6
+    private String abvLabel;       // "83.2%"
+}