[feat] Tag 중복확인 API 구현

src/main/java/com/leets/team2/xclone/common/entity/AbstractEntity.java

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+package com.leets.team2.xclone.common.entity;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.EntityListeners;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.MappedSuperclass;
+import java.time.LocalDateTime;
+import lombok.Getter;
+import lombok.Setter;
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.annotation.LastModifiedDate;
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
+
+@MappedSuperclass
+@EntityListeners(AuditingEntityListener.class)
+@Getter
+@Setter
+public abstract class AbstractEntity {
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  protected Long id;
+
+  @CreatedDate
+  @Column(name = "created_at", nullable = false, updatable = false)
+  private LocalDateTime createdAt;
+
+  @LastModifiedDate
+  @Column(name = "updated_at")
+  private LocalDateTime updatedAt;
+}

src/main/java/com/leets/team2/xclone/domain/member/controller/MemberController.java

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+package com.leets.team2.xclone.domain.member.controller;
+
+public interface MemberController {
+
+}

src/main/java/com/leets/team2/xclone/domain/member/controller/MemberControllerImpl.java

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+package com.leets.team2.xclone.domain.member.controller;
+
+import com.leets.team2.xclone.domain.member.service.MemberService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+@Controller
+@RequestMapping("/api/members")
+@RequiredArgsConstructor
+public class MemberControllerImpl implements MemberController{
+
+  private final MemberService memberService;
+}

src/main/java/com/leets/team2/xclone/domain/member/entities/Member.java

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+package com.leets.team2.xclone.domain.member.entities;
+
+import com.leets.team2.xclone.common.entity.AbstractEntity;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Table;
+import java.time.LocalDateTime;
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Table(name = "member")
+@Builder
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor(access = AccessLevel.PRIVATE)
+@Getter
+public class Member extends AbstractEntity {
+
+  @Column(name = "phone_number", nullable = false)
+  private String phoneNumber;
+
+  @Column(name = "birth_date", nullable = true)
+  private LocalDateTime birthDate;
+
+  @Column(name = "tag", nullable = false, unique = true)
+  private String tag;
+
+  @Column(name = "nickname", nullable = false)
+  private String nickname;
+
+  @Column(name = "introduction", nullable = true)
+  private String introduction;
+}

src/main/java/com/leets/team2/xclone/domain/member/repository/MemberRepository.java

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+package com.leets.team2.xclone.domain.member.repository;
+
+import com.leets.team2.xclone.domain.member.entities.Member;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface MemberRepository extends JpaRepository<Member, Long> {
+}

src/main/java/com/leets/team2/xclone/domain/member/service/MemberService.java

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+package com.leets.team2.xclone.domain.member.service;
+
+import com.leets.team2.xclone.domain.member.repository.MemberRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class MemberService {
+
+  private final MemberRepository memberRepository;
+}