[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/agent/tools/search_internet.py

@@ -34,7 +34,7 @@ async def search_engine_iter(query: str , uid: str):
     response = await search_engine_chat(uid = uid,
                                         query=query,
                                         search_engine_name="zhipu_search",
-                                        model_name=LLM_MODELS[1],
+                                        model_name=LLM_MODELS[0],
                                         temperature=TEMPERATURE,  # Agent搜索互联网的时候，温度设为0.1
                                         history=[],
                                         top_k=VECTOR_SEARCH_TOP_K,