init ai backend

backend/src/main/java/com/zl/mjga/service/DeepSeekAiService.java

@@ -0,0 +1,19 @@
+package com.zl.mjga.service;
+
+import com.zl.mjga.config.ai.DeepSeekChatAssistant;
+import dev.langchain4j.service.TokenStream;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+@Slf4j
+public class DeepSeekAiService {
+
+  private final DeepSeekChatAssistant deepSeekChatAssistant;
+
+  public TokenStream chat(String sessionIdentifier, String userMessage) {
+    return deepSeekChatAssistant.chat(sessionIdentifier, userMessage);
+  }
+}