feat(user): add user entity and repository with JPA integration

weblog-module-common/src/main/java/com/hanserwei/common/domain/dataobject/User.java

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+package com.hanserwei.common.domain.dataobject;
+
+import jakarta.persistence.*; // 使用 Jakarta Persistence API (JPA 3.0+)
+import lombok.Builder;
+import lombok.Getter;
+import lombok.Setter;
+import org.hibernate.annotations.CreationTimestamp;
+import org.hibernate.annotations.UpdateTimestamp;
+
+import java.io.Serial;
+import java.io.Serializable;
+import java.time.Instant; // 推荐用于 TIMESTAMP WITH TIME ZONE
+
+/**
+ * 用户表（t_user 对应实体）
+ */
+@Entity
+@Setter
+@Getter
+@Builder
+@Table(name = "t_user") // 对应数据库中的表名
+public class User implements Serializable {
+
+    @Serial
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * ID (BIG SERIAL)
+     */
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "id")
+    private Long id;
+
+    /**
+     * 用户名 (VARCHAR(60) NOT NULL UNIQUE)
+     */
+    @Column(name = "username", length = 60, nullable = false, unique = true)
+    private String username;
+
+    /**
+     * 密码 (VARCHAR(60) NOT NULL)
+     */
+    @Column(name = "password", length = 60, nullable = false)
+    private String password;
+
+    /**
+     * 创建时间 (TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW())
+     * 使用 Hibernate 的 @CreationTimestamp 确保创建时自动赋值
+     */
+    @CreationTimestamp
+    @Column(name = "create_time", nullable = false, updatable = false)
+    private Instant createTime;
+
+    /**
+     * 最后一次更新时间 (TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW())
+     * 使用 Hibernate 的 @UpdateTimestamp 确保更新时自动赋值
+     * 注意：虽然数据库有触发器，但使用此注解可保持 ORM 层的同步性
+     */
+    @UpdateTimestamp
+    @Column(name = "update_time", nullable = false)
+    private Instant updateTime;
+
+    /**
+     * 逻辑删除：FALSE：未删除 TRUE：已删除 (BOOLEAN NOT NULL DEFAULT FALSE)
+     */
+    @Builder.Default
+    @Column(name = "is_deleted", nullable = false)
+    private Boolean isDeleted = false; // 对应数据库默认值
+
+    public User() {
+    }
+
+    public User(Long id, String username, String password, Instant createTime, Instant updateTime, Boolean isDeleted) {
+        this.id = id;
+        this.username = username;
+        this.password = password;
+        this.createTime = createTime;
+        this.updateTime = updateTime;
+        this.isDeleted = isDeleted;
+    }
+}

weblog-module-common/src/main/java/com/hanserwei/common/domain/repository/UserRepository.java

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+package com.hanserwei.common.domain.repository;
+
+import com.hanserwei.common.domain.dataobject.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface UserRepository extends JpaRepository<User, Long> {
+}