[BE] feat: 하이라이트 추가 및 수정 API 구현

backend/src/main/java/reviewme/highlight/domain/HighLight.java

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+package reviewme.highlight.domain;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+import lombok.AccessLevel;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Table(name = "highlight")
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@EqualsAndHashCode(of = "id")
+@Getter
+public class HighLight {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(name = "question_id", nullable = false)
+    private long questionId;
+
+    @Column(name = "review_group_id", nullable = false)
+    private long reviewGroupId;
+
+    @Column(name = "answer_id", nullable = false)
+    private long answerId;
+
+    @Column(name = "line_index", nullable = false)
+    private long lineIndex;
+
+    @Column(name = "start_index", nullable = false)
+    private long startIndex;
+
+    @Column(name = "end_index", nullable = false)
+    private long endIndex;
+
+    public HighLight(long answerId, long questionId, long reviewGroupId,
+                     long lineIndex, long startIndex, long endIndex) {
+        this.answerId = answerId;
+        this.questionId = questionId;
+        this.reviewGroupId = reviewGroupId;
+        this.lineIndex = lineIndex;
+        this.startIndex = startIndex;
+        this.endIndex = endIndex;
+    }
+}

backend/src/main/java/reviewme/highlight/repository/HighlightRepository.java

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+package reviewme.highlight.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import reviewme.highlight.domain.HighLight;
+
+public interface HighlightRepository extends JpaRepository<HighLight, Long> {
+}

backend/src/main/resources/db/migration/V3__create_highlight_table.sql

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+-- highlight 테이블을 생성합니다.
+
+CREATE TABLE highlight
+(
+    id              BIGINT AUTO_INCREMENT,
+    questionId      BIGINT NOT NULl,
+    review_group_id BIGINT NOT NULl,
+    answer_id       BIGINT NOT NULl,
+    line_index      BIGINT NOT NULl,
+    start_index     BIGINT NOT NULl,
+    end_index       BIGINT NOT NULl,
+    PRIMARY KEY (id)
+);