feat: 소식지 좋아요 엔티티 추가

src/main/java/com/example/solidconnection/news/domain/LikedNews.java

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+package com.example.solidconnection.news.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 jakarta.persistence.UniqueConstraint;
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Getter
+@AllArgsConstructor
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Table(uniqueConstraints = {
+        @UniqueConstraint(
+                name = "uk_liked_news_site_user_id_news_id",
+                columnNames = {"site_user_id", "news_id"}
+        )
+})
+public class LikedNews {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(name = "news_id")
+    private long newsId;
+
+    @Column(name = "site_user_id")
+    private long siteUserId;
+}

src/main/resources/db/migration/V21__create_liked_news_table.sql

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+CREATE TABLE liked_news (
+    id BIGINT NOT NULL AUTO_INCREMENT,
+    news_id BIGINT NOT NULL,
+    site_user_id BIGINT NOT NULL,
+    PRIMARY KEY (id),
+    CONSTRAINT uk_liked_news_site_user_id_news_id UNIQUE (site_user_id, news_id),
+    CONSTRAINT fk_liked_news_news_id FOREIGN KEY (news_id) REFERENCES news(id),
+    CONSTRAINT fk_liked_news_site_user_id FOREIGN KEY (site_user_id) REFERENCES site_user(id)
+);