添加消息相关表

manager/src/main/java/org/jiayunet/mapper/MessageMapper.java

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+package org.jiayunet.mapper;
+
+import org.apache.ibatis.annotations.Mapper;
+import org.jiayunet.pojo.po.Message;
+
+/**
+ * 站内信消息Mapper
+ *
+ * @author zk
+ */
+@Mapper
+public interface MessageMapper extends CommonMapper<Message> {
+}

manager/src/main/java/org/jiayunet/mapper/MessageReadMapper.java

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+package org.jiayunet.mapper;
+
+import org.apache.ibatis.annotations.Mapper;
+import org.jiayunet.pojo.po.MessageRead;
+
+/**
+ * 消息已读状态Mapper
+ *
+ * @author zk
+ */
+@Mapper
+public interface MessageReadMapper extends CommonMapper<MessageRead> {
+}

manager/src/main/java/org/jiayunet/pojo/po/Message.java

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+package org.jiayunet.pojo.po;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+import java.time.Instant;
+
+/**
+ * 站内信消息表（bg_message）
+ * <p>统一存储系统消息、运营消息、订单消息</p>
+ *
+ * @author zk
+ */
+@Data
+@TableName("bg_message")
+public class Message {
+
+    @TableId(type = IdType.ASSIGN_ID)
+    private Long id;
+
+    /** 消息类型 1=系统消息 2=运营消息 3=订单消息 */
+    private Integer type;
+
+    /** 目标类型 1=指定用户 2=全部用户 */
+    private Integer targetType;
+
+    /** 目标用户ID，targetType=1时必填，2时为NULL */
+    private Long userId;
+
+    /** 消息标题 */
+    private String title;
+
+    /** 消息内容 */
+    private String content;
+
+    /** 关联业务类型，如 order/resume_diagnose */
+    private String bizType;
+
+    /** 关联业务ID，配合 bizType 跳转 */
+    private Long bizId;
+
+    /** 创建时间 */
+    private Instant createTime;
+}

manager/src/main/java/org/jiayunet/pojo/po/MessageRead.java

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+package org.jiayunet.pojo.po;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+import java.time.Instant;
+
+/**
+ * 消息已读状态表（bg_message_read）
+ * <p>记录用户对消息的已读状态，用户读了才插入一条记录</p>
+ *
+ * @author zk
+ */
+@Data
+@TableName("bg_message_read")
+public class MessageRead {
+
+    @TableId(type = IdType.ASSIGN_ID)
+    private Long id;
+
+    /** 消息ID，关联 bg_message.id */
+    private Long messageId;
+
+    /** 用户ID */
+    private Long userId;
+
+    /** 阅读时间 */
+    private Instant readTime;
+}

manager/src/main/java/org/jiayunet/service/MessageService.java

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+package org.jiayunet.service;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import org.jiayunet.mapper.MessageMapper;
+import org.jiayunet.mapper.MessageReadMapper;
+import org.jiayunet.pojo.po.Message;
+import org.jiayunet.pojo.po.MessageRead;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.util.Assert;
+
+import java.time.Instant;
+
+/**
+ * 站内信消息服务
+ * <p>提供消息发送和已读标记能力，供 C 端和 B 端共用</p>
+ * <p>使用表：bg_message（消息主表）、bg_message_read（已读状态表）</p>
+ *
+ * @author zk
+ */
+@Service
+public class MessageService {
+
+    @Autowired
+    private MessageMapper messageMapper;
+
+    @Autowired
+    private MessageReadMapper messageReadMapper;
+
+    /**
+     * 发送消息（指定用户）
+     */
+    @Transactional(rollbackFor = Exception.class)
+    public void sendToUser(Integer type, Long userId, String title, String content, String bizType, Long bizId) {
+        Assert.notNull(userId, "目标用户ID不能为空");
+        Message msg = new Message();
+        msg.setType(type);
+        msg.setTargetType(1);
+        msg.setUserId(userId);
+        msg.setTitle(title);
+        msg.setContent(content);
+        msg.setBizType(bizType);
+        msg.setBizId(bizId);
+        msg.setCreateTime(Instant.now());
+        messageMapper.insert(msg);
+    }
+
+    /**
+     * 发送消息（全部用户）
+     */
+    @Transactional(rollbackFor = Exception.class)
+    public void sendToAll(Integer type, String title, String content) {
+        Message msg = new Message();
+        msg.setType(type);
+        msg.setTargetType(2);
+        msg.setTitle(title);
+        msg.setContent(content);
+        msg.setCreateTime(Instant.now());
+        messageMapper.insert(msg);
+    }
+
+    /**
+     * 标记消息已读（幂等，重复调用不报错）
+     */
+    @Transactional(rollbackFor = Exception.class)
+    public void markRead(Long messageId, Long userId) {
+        Long count = messageReadMapper.selectCount(new LambdaQueryWrapper<MessageRead>().eq(MessageRead::getMessageId, messageId).eq(MessageRead::getUserId, userId));
+        if (count > 0) return;
+        MessageRead read = new MessageRead();
+        read.setMessageId(messageId);
+        read.setUserId(userId);
+        read.setReadTime(Instant.now());
+        messageReadMapper.insert(read);
+    }
+}