[Chore] 멘토링 관련 엔티티 구현

back/src/main/java/com/back/domain/mentoring/mentoring/entity/Mentoring.java

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+package com.back.domain.mentoring.mentoring.entity;
+
+import com.back.domain.member.mentor.entity.Mentor;
+import com.back.global.jpa.BaseEntity;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import lombok.Getter;
+
+@Entity
+@Getter
+public class Mentoring extends BaseEntity {
+    @ManyToOne
+    @JoinColumn(name = "mentor_id")
+    private Mentor mentor;
+
+    @Column(length = 100)
+    private String title;
+
+    @Column(columnDefinition = "TEXT")
+    private String bio;
+
+    @Column(columnDefinition = "JSON")
+    private String tags;
+
+    @Column(length = 255)
+    private String thumb;
+}

back/src/main/java/com/back/domain/mentoring/mentoring/entity/Review.java

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+package com.back.domain.mentoring.mentoring.entity;
+
+import com.back.domain.mentoring.reservation.entity.Reservation;
+import com.back.global.jpa.BaseEntity;
+import jakarta.persistence.*;
+import lombok.Getter;
+
+@Entity
+@Getter
+public class Review extends BaseEntity {
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "reservation_id", nullable = false)
+    private Reservation reservation;
+
+    @Column(nullable = false)
+    private double rating;
+
+    @Column(columnDefinition = "TEXT")
+    private String content;
+}

back/src/main/java/com/back/domain/mentoring/mentoring/repository/MentoRepository.java

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+package com.back.domain.mentoring.mentoring.repository;
+
+import com.back.domain.mentoring.mentoring.entity.Mentoring;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface MentoRepository extends JpaRepository<Mentoring, Long> {
+}

back/src/main/java/com/back/domain/mentoring/mentoring/repository/ReviewRepository.java

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+package com.back.domain.mentoring.mentoring.repository;
+
+import com.back.domain.mentoring.mentoring.entity.Review;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface ReviewRepository extends JpaRepository<Review, Long> {
+}

back/src/main/java/com/back/domain/mentoring/reservation/constant/ReservationStatus.java

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+package com.back.domain.mentoring.reservation.constant;
+
+public enum ReservationStatus {
+    PENDING,    // 예약 승인 대기
+    APPROVED,   // 승인됨
+    REJECTED,   // 거절됨
+    CANCELED,   // 취소됨
+    COMPLETED   // 완료됨
+}

back/src/main/java/com/back/domain/mentoring/reservation/entity/Reservation.java

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+package com.back.domain.mentoring.reservation.entity;
+
+import com.back.domain.member.mentee.entity.Mentee;
+import com.back.domain.member.mentor.entity.Mentor;
+import com.back.domain.mentoring.mentoring.entity.Mentoring;
+import com.back.domain.mentoring.reservation.constant.ReservationStatus;
+import com.back.domain.mentoring.slot.entity.MentorSlot;
+import com.back.global.jpa.BaseEntity;
+import jakarta.persistence.*;
+import lombok.Getter;
+
+@Entity
+@Getter
+public class Reservation extends BaseEntity {
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "mentoring_id", nullable = false)
+    private Mentoring mentoring;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "mentor_id", nullable = false)
+    private Mentor mentor;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "mentee_id", nullable = false)
+    private Mentee mentee;
+
+    @OneToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "mentor_slot_id", nullable = false)
+    private MentorSlot mentorSlot;
+
+    @Column(columnDefinition = "TEXT")
+    private String preQuestion;
+
+    @Enumerated(EnumType.STRING)
+    @Column(nullable = false)
+    private ReservationStatus status;
+}

back/src/main/java/com/back/domain/mentoring/reservation/repository/ReservationRepository.java

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+package com.back.domain.mentoring.reservation.repository;
+
+import com.back.domain.mentoring.reservation.entity.Reservation;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface ReservationRepository extends JpaRepository<Reservation, Long> {
+}

back/src/main/java/com/back/domain/mentoring/slot/constant/MentorSlotStatus.java

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+package com.back.domain.mentoring.slot.constant;
+
+public enum MentorSlotStatus {
+    AVAILABLE,  // 예약 가능
+    PENDING,    // 예약 승인 대기
+    APPROVED,   // 예약 승인됨(확정)
+    COMPLETED   // 멘토링 완료
+}

back/src/main/java/com/back/domain/mentoring/slot/entity/MentorSlot.java

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+package com.back.domain.mentoring.slot.entity;
+
+import com.back.domain.member.mentor.entity.Mentor;
+import com.back.domain.mentoring.reservation.constant.ReservationStatus;
+import com.back.domain.mentoring.reservation.entity.Reservation;
+import com.back.domain.mentoring.slot.constant.MentorSlotStatus;
+import com.back.global.jpa.BaseEntity;
+import jakarta.persistence.*;
+import lombok.Getter;
+
+import java.time.LocalDateTime;
+
+@Entity
+@Getter
+public class MentorSlot extends BaseEntity {
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "mentor_id", nullable = false)
+    private Mentor mentor;
+
+    @Column(nullable = false)
+    private LocalDateTime startDateTime;
+
+    @Column(nullable = false)
+    private LocalDateTime endDateTime;
+
+    @OneToOne(mappedBy = "mentorSlot")
+    private Reservation reservation;
+
+    public MentorSlotStatus getStatus() {
+        if (reservation == null) {
+            return MentorSlotStatus.AVAILABLE;
+        }
+
+        return switch (reservation.getStatus()) {
+            case PENDING -> MentorSlotStatus.PENDING;
+            case APPROVED -> MentorSlotStatus.APPROVED;
+            case COMPLETED -> MentorSlotStatus.COMPLETED;
+            default -> MentorSlotStatus.AVAILABLE;
+        };
+    }
+
+    public boolean isAvailable() {
+        return reservation == null ||
+            reservation.getStatus().equals(ReservationStatus.REJECTED) ||
+            reservation.getStatus().equals(ReservationStatus.CANCELED);
+    }
+}

back/src/main/java/com/back/domain/mentoring/slot/repository/MentorSlotRepository.java

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+package com.back.domain.mentoring.slot.repository;
+
+import com.back.domain.mentoring.slot.entity.MentorSlot;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface MentorSlotRepository extends JpaRepository<MentorSlot, Long> {
+}