feat(chat): 新增AI聊天记录持久化功能

新增KeyboardAiChatMessage实体及对应Mapper、Service，在ChatServiceImpl中同步对话时保存用户与AI消息到数据库，实现聊天记录持久化

src/main/java/com/yolo/keyborad/mapper/KeyboardAiChatMessageMapper.java

@@ -0,0 +1,12 @@
+package com.yolo.keyborad.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.yolo.keyborad.model.entity.KeyboardAiChatMessage;
+
+/*
+* @author: ziin
+* @date: 2026/1/26 17:00
+*/
+    
+public interface KeyboardAiChatMessageMapper extends BaseMapper<KeyboardAiChatMessage> {
+}

src/main/java/com/yolo/keyborad/model/entity/KeyboardAiChatMessage.java

@@ -0,0 +1,78 @@
+package com.yolo.keyborad.model.entity;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import io.swagger.v3.oas.annotations.media.Schema;
+import java.util.Date;
+import lombok.Data;
+
+/*
+* @author: ziin
+* @date: 2026/1/26 17:00
+*/
+    
+/**
+ * 用户与AI情感陪伴角色的聊天记录表
+ */
+@Schema(description="用户与AI情感陪伴角色的聊天记录表")
+@Data
+@TableName(value = "keyboard_ai_chat_message")
+public class KeyboardAiChatMessage {
+    /**
+     * 聊天消息唯一ID
+     */
+    @TableId(value = "id", type = IdType.AUTO)
+    @Schema(description="聊天消息唯一ID")
+    private Long id;
+
+    /**
+     * 用户ID
+     */
+    @TableField(value = "user_id")
+    @Schema(description="用户ID")
+    private Long userId;
+
+    /**
+     * 陪伴角色ID
+     */
+    @TableField(value = "companion_id")
+    @Schema(description="陪伴角色ID")
+    private Long companionId;
+
+    /**
+     * 消息发送方：1=用户，2=AI
+     */
+    @TableField(value = "sender")
+    @Schema(description="消息发送方：1=用户，2=AI")
+    private Short sender;
+
+    /**
+     * 聊天消息内容
+     */
+    @TableField(value = "content")
+    @Schema(description="聊天消息内容")
+    private String content;
+
+    /**
+     * AI识别到的用户情绪
+     */
+    @TableField(value = "emotion_detected")
+    @Schema(description="AI识别到的用户情绪")
+    private String emotionDetected;
+
+    /**
+     * AI提供的支持类型（倾听/共情/安抚等）
+     */
+    @TableField(value = "support_type")
+    @Schema(description="AI提供的支持类型（倾听/共情/安抚等）")
+    private String supportType;
+
+    /**
+     * 消息创建时间
+     */
+    @TableField(value = "created_at")
+    @Schema(description="消息创建时间")
+    private Date createdAt;
+}

src/main/java/com/yolo/keyborad/service/KeyboardAiChatMessageService.java

@@ -0,0 +1,13 @@
+package com.yolo.keyborad.service;
+
+import com.yolo.keyborad.model.entity.KeyboardAiChatMessage;
+import com.baomidou.mybatisplus.extension.service.IService;
+    /*
+* @author: ziin
+* @date: 2026/1/26 17:00
+*/
+    
+public interface KeyboardAiChatMessageService extends IService<KeyboardAiChatMessage>{
+
+
+}

src/main/java/com/yolo/keyborad/service/impl/ChatServiceImpl.java

@@ -10,6 +10,7 @@ import com.yolo.keyborad.config.NacosAppConfigCenter;
 import com.yolo.keyborad.exception.BusinessException;
 import com.yolo.keyborad.model.dto.chat.ChatReq;
 import com.yolo.keyborad.model.dto.chat.ChatStreamMessage;
+import com.yolo.keyborad.model.entity.KeyboardAiChatMessage;
 import com.yolo.keyborad.model.entity.KeyboardCharacter;
 import com.yolo.keyborad.model.entity.KeyboardUser;
 import com.yolo.keyborad.model.entity.KeyboardUserCallLog;
@@ -77,6 +78,9 @@ public class ChatServiceImpl implements ChatService {
     @Resource
     private KeyboardAiCompanionService aiCompanionService;
 
+    @Resource
+    private KeyboardAiChatMessageService aiChatMessageService;
+
     @Resource
     private ElevenLabsService elevenLabsService;
 
@@ -372,6 +376,9 @@ public class ChatServiceImpl implements ChatService {
         long llmDuration = System.currentTimeMillis() - startTime;
         log.info("LLM 完成, userId: {}, 耗时: {}ms, 响应长度: {}", userId, llmDuration, response.length());
 
+        // 保存用户消息和AI响应到聊天记录
+        saveChatMessages(Long.parseLong(userId), companionId, content, response);
+
         // 生成音频任务 ID
         String audioId = UUID.randomUUID().toString().replace("-", "");
 
@@ -388,6 +395,33 @@ public class ChatServiceImpl implements ChatService {
                 .build();
     }
 
+    /**
+     * 保存用户消息和AI响应到聊天记录
+     */
+    private void saveChatMessages(Long userId, Long companionId, String userContent, String aiResponse) {
+        Date now = new Date();
+
+        // 保存用户消息 (sender=1)
+        KeyboardAiChatMessage userMessage = new KeyboardAiChatMessage();
+        userMessage.setUserId(userId);
+        userMessage.setCompanionId(companionId);
+        userMessage.setSender((short) 1);
+        userMessage.setContent(userContent);
+        userMessage.setCreatedAt(now);
+
+        // 保存AI响应 (sender=2)
+        KeyboardAiChatMessage aiMessage = new KeyboardAiChatMessage();
+        aiMessage.setUserId(userId);
+        aiMessage.setCompanionId(companionId);
+        aiMessage.setSender((short) 2);
+        aiMessage.setContent(aiResponse);
+        aiMessage.setCreatedAt(now);
+
+        // 批量保存
+        aiChatMessageService.saveBatch(List.of(userMessage, aiMessage));
+        log.info("聊天记录保存成功, userId: {}, companionId: {}", userId, companionId);
+    }
+
     /**
      * 调用 LLM 生成响应
      */

src/main/java/com/yolo/keyborad/service/impl/KeyboardAiChatMessageServiceImpl.java

@@ -0,0 +1,18 @@
+package com.yolo.keyborad.service.impl;
+
+import org.springframework.stereotype.Service;
+import org.springframework.beans.factory.annotation.Autowired;
+import java.util.List;
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import com.yolo.keyborad.mapper.KeyboardAiChatMessageMapper;
+import com.yolo.keyborad.model.entity.KeyboardAiChatMessage;
+import com.yolo.keyborad.service.KeyboardAiChatMessageService;
+/*
+* @author: ziin
+* @date: 2026/1/26 17:00
+*/
+    
+@Service
+public class KeyboardAiChatMessageServiceImpl extends ServiceImpl<KeyboardAiChatMessageMapper, KeyboardAiChatMessage> implements KeyboardAiChatMessageService{
+
+}

src/main/resources/mapper/KeyboardAiChatMessageMapper.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.yolo.keyborad.mapper.KeyboardAiChatMessageMapper">
+  <resultMap id="BaseResultMap" type="com.yolo.keyborad.model.entity.KeyboardAiChatMessage">
+    <!--@mbg.generated-->
+    <!--@Table keyboard_ai_chat_message-->
+    <id column="id" jdbcType="BIGINT" property="id" />
+    <result column="user_id" jdbcType="BIGINT" property="userId" />
+    <result column="companion_id" jdbcType="BIGINT" property="companionId" />
+    <result column="sender" jdbcType="SMALLINT" property="sender" />
+    <result column="content" jdbcType="VARCHAR" property="content" />
+    <result column="emotion_detected" jdbcType="VARCHAR" property="emotionDetected" />
+    <result column="support_type" jdbcType="VARCHAR" property="supportType" />
+    <result column="created_at" jdbcType="TIMESTAMP" property="createdAt" />
+  </resultMap>
+  <sql id="Base_Column_List">
+    <!--@mbg.generated-->
+    id, user_id, companion_id, sender, content, emotion_detected, support_type, created_at
+  </sql>
+</mapper>