fix: 兼容旧代码，添加deepseek服务调用

ruoyi-modules/ruoyi-chat/src/main/java/org/ruoyi/service/chat/impl/provider/DeepseekServiceImpl.java

@@ -0,0 +1,46 @@
+package org.ruoyi.service.chat.impl.provider;
+
+import dev.langchain4j.data.message.ChatMessage;
+import dev.langchain4j.model.chat.StreamingChatModel;
+import dev.langchain4j.model.chat.response.StreamingChatResponseHandler;
+import dev.langchain4j.model.openai.OpenAiStreamingChatModel;
+import lombok.extern.slf4j.Slf4j;
+import org.ruoyi.common.chat.domain.dto.request.ChatRequest;
+import org.ruoyi.common.chat.domain.vo.chat.ChatModelVo;
+import org.ruoyi.enums.ChatModeType;
+import org.ruoyi.service.chat.impl.AbstractStreamingChatService;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+/**
+ * @Author: xiaoen
+ * @Description: deepseek 服务调用
+ * @Date: Created in 19:12 2026/3/17
+ */
+@Service
+@Slf4j
+public class DeepseekServiceImpl extends AbstractStreamingChatService {
+
+    @Override
+    public StreamingChatModel buildStreamingChatModel(ChatModelVo chatModelVo, ChatRequest chatRequest) {
+        return OpenAiStreamingChatModel.builder()
+            .baseUrl(chatModelVo.getApiHost())
+            .apiKey(chatModelVo.getApiKey())
+            .modelName(chatModelVo.getModelName())
+            .returnThinking(chatRequest.getEnableThinking())
+            .build();
+    }
+
+    @Override
+    public void doChat(ChatModelVo chatModelVo, ChatRequest chatRequest, List<ChatMessage> messagesWithMemory, StreamingChatResponseHandler handler) {
+        StreamingChatModel streamingChatModel = buildStreamingChatModel(chatModelVo, chatRequest);
+        streamingChatModel.chat(messagesWithMemory, handler);
+    }
+
+    @Override
+    public String getProviderName() {
+        return ChatModeType.DEEP_SEEK.getCode();
+    }
+
+}