[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/search_engine_chat.py

@@ -364,7 +364,7 @@ async def search_engine_chat(uid: Optional[str]=Body(None, description="userID")
                                                                 "content": "虎头虎脑"}]]
                                                            ),
                              stream: bool = Body(False, description="流式输出"),
-                             model_name: str = Body(LLM_MODELS[1], description="LLM 模型名称。"),
+                             model_name: str = Body(LLM_MODELS[0], description="LLM 模型名称。"),
                              temperature: float = Body(TEMPERATURE, description="LLM 采样温度", ge=0.0, le=1.0),
                              max_tokens: Optional[int] = Body(None, description="限制LLM生成Token数量，默认None代表模型最大值"),
                              prompt_name: str = Body("default",
@@ -483,7 +483,7 @@ async def search_engine_chat(uid: Optional[str]=Body(None, description="userID")
                                           search_engine_name: str,
                                           top_k: int,
                                           history: Optional[List[History]],
-                                          model_name: str = LLM_MODELS[1],
+                                          model_name: str = LLM_MODELS[0],
                                           prompt_name: str = prompt_name,
                                           kgo_search_type: str = kgo_search_type
                                           ) -> AsyncIterable[str]: