feat(ai): 实现AI聊天功能并集成数据库工具

- 新增 AiChatController 支持流式聊天响应
- 创建 AIResponse 和 ChatMessageDTO 用于数据传输
- 开发 AiDBTools 提供用户相关的增删改查及封禁功能- 配置 ChatClient 支持默认工具调用
- 调整 User 实体类时间字段为 OffsetDateTime 并格式化- 添加 jackson-datatype-jsr310 依赖以支持 JSR310 时间序列化
- 修改 PostgreSQL 连接字符串时区配置
- 启用 Jackson 日期写入为字符串而非时间戳

snails-chat/src/main/java/com/hanserwei/chat/controller/AiChatController.java

@@ -0,0 +1,36 @@
+package com.hanserwei.chat.controller;
+
+import com.hanserwei.chat.model.dto.ChatMessageDTO;
+import com.hanserwei.chat.model.vo.AIResponse;
+import jakarta.annotation.Resource;
+import org.springframework.ai.chat.client.ChatClient;
+import org.springframework.ai.chat.memory.ChatMemory;
+import org.springframework.http.MediaType;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import reactor.core.publisher.Flux;
+
+@RestController
+@RequestMapping("/ai")
+public class AiChatController {
+
+    @Resource
+    private ChatClient dashScopeChatClient;
+
+    @PostMapping(path = "/chat", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
+    public Flux<AIResponse> chatWithAi(@RequestBody ChatMessageDTO chatMessageDTO) {
+
+        return dashScopeChatClient.prompt()
+                .user(chatMessageDTO.getMessage())
+                .advisors(p -> p.param(ChatMemory.CONVERSATION_ID, chatMessageDTO.getConversionId()))
+                .stream()
+                .chatResponse()
+                .mapNotNull(chatResponse -> AIResponse.builder()
+                        .v(chatResponse.getResult().getOutput().getText())
+                        .build());
+
+    }
+
+}