feat(oa): 添加 AI 对话管理功能

- 新增 AI配置、对话历史、对话消息等相关的实体类、Mapper、Service 和 Controller
- 实现 AI 对话管理的基础功能，包括创建对话、发送消息、结束对话等- 集成 DeepSeek AI 服务，实现与 AI 模型的交互
- 添加 token消耗和费用计算相关逻辑

ruoyi-oa/src/main/java/com/ruoyi/oa/mapper/SysOaAiConfigMapper.java

@@ -0,0 +1,15 @@
+package com.ruoyi.oa.mapper;
+
+import com.ruoyi.common.core.mapper.BaseMapperPlus;
+import com.ruoyi.oa.domain.SysOaAiConfig;
+import com.ruoyi.oa.domain.vo.SysOaAiConfigVo;
+
+/**
+ * AI配置Mapper接口
+ *
+ * @author ruoyi
+ * @date 2024-12-19
+ */
+public interface SysOaAiConfigMapper extends BaseMapperPlus<SysOaAiConfigMapper, SysOaAiConfig, SysOaAiConfigVo> {
+
+} 

ruoyi-oa/src/main/java/com/ruoyi/oa/mapper/SysOaAiConversationMapper.java

@@ -0,0 +1,15 @@
+package com.ruoyi.oa.mapper;
+
+import com.ruoyi.common.core.mapper.BaseMapperPlus;
+import com.ruoyi.oa.domain.SysOaAiConversation;
+import com.ruoyi.oa.domain.vo.SysOaAiConversationVo;
+
+/**
+ * AI对话历史Mapper接口
+ *
+ * @author ruoyi
+ * @date 2024-12-19
+ */
+public interface SysOaAiConversationMapper extends BaseMapperPlus<SysOaAiConversationMapper, SysOaAiConversation, SysOaAiConversationVo> {
+
+} 

ruoyi-oa/src/main/java/com/ruoyi/oa/mapper/SysOaAiMessageMapper.java

@@ -0,0 +1,26 @@
+package com.ruoyi.oa.mapper;
+
+import com.ruoyi.common.core.mapper.BaseMapperPlus;
+import com.ruoyi.oa.domain.SysOaAiMessage;
+import com.ruoyi.oa.domain.vo.SysOaAiMessageVo;
+import org.apache.ibatis.annotations.Param;
+
+import java.util.List;
+
+/**
+ * AI对话详情Mapper接口
+ *
+ * @author ruoyi
+ * @date 2024-12-19
+ */
+public interface SysOaAiMessageMapper extends BaseMapperPlus<SysOaAiMessageMapper, SysOaAiMessage, SysOaAiMessageVo> {
+
+    /**
+     * 根据对话ID查询消息列表
+     *
+     * @param conversationId 对话ID
+     * @return 消息列表
+     */
+    List<SysOaAiMessageVo> selectMessagesByConversationId(@Param("conversationId") Long conversationId);
+
+}