[RAG] 全部LLM硬编码从deepseek-r1改为deepseek-v3；修复知识库问答source格式不匹配导致检索结果被丢弃

langchain-chat/server/chat/chat.py

@@ -62,7 +62,7 @@ async def chat(query: str = Body(..., description="用户输入", examples=["恼
 
         if prompt_name == "Search Summary":
             model = get_ChatOpenAI(
-                model_name=LLM_MODELS[1],
+                model_name=LLM_MODELS[0],
                 temperature=temperature,
                 max_tokens=max_tokens,
                 callbacks=callbacks,