[feat] User 도메인 추가#7 (#11)

* feat: User 엔티티추가

* feat: User DTO 추가

* feat: UserRepository 추가

Author: MEOHIN

src/main/java/com/back/domain/user/dto/UserDto.java

@@ -0,0 +1,38 @@
+package com.back.domain.user.dto;
+
+import com.back.domain.user.entity.User;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class UserDto {
+
+    private Long id;
+    private String email;
+    private String nickname;
+    private String profileImgUrl;
+    private Double abvDegree;
+    private LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
+
+    public static UserDto from(User user) {
+        if (user == null) return null;
+        return UserDto.builder()
+                .id(user.getId())
+                .email(user.getEmail())
+                .nickname(user.getNickname())
+                .profileImgUrl(user.getProfileImgUrl())
+                .abvDegree(user.getAbvDegree())
+                .createdAt(user.getCreatedAt())
+                .updatedAt(user.getUpdatedAt())
+                .build();
+    }
+}
+

src/main/java/com/back/domain/user/entity/User.java

@@ -0,0 +1,44 @@
+package com.back.domain.user.entity;
+
+import jakarta.persistence.*;
+import jakarta.validation.constraints.Email;
+import jakarta.validation.constraints.NotBlank;
+import lombok.*;
+
+import java.time.LocalDateTime;
+
+@Entity
+@Table(
+        name = "users", // DB 테이블 이름: User 대신 users 권장 (예약어 충돌 방지)
+        indexes = {
+                @Index(name = "ux_users_email", columnList = "email", unique = true)
+        }
+)
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class User {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @NotBlank
+    @Email
+    @Column(nullable = false, unique = true)
+    private String email;   // 유저 소셜 이메일 (OAuth2 로그인 시 저장)
+
+    @NotBlank
+    @Column(nullable = false, unique = true)
+    private String nickname;   // 유저 닉네임
+
+    private String profileImgUrl;   // 프로필 이미지 URL
+
+    private Double abvDegree;   // 온도(회원 등급)
+
+    private LocalDateTime createdAt;   // 생성 날짜
+
+    private LocalDateTime updatedAt;   // 수정 날짜
+}

src/main/java/com/back/domain/user/repository/UserRepository.java

@@ -0,0 +1,10 @@
+package com.back.domain.user.repository;
+
+import com.back.domain.user.entity.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface UserRepository extends JpaRepository<User, Long> {
+}
+