[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/self_kb_chat.py

@@ -72,7 +72,7 @@ async def self_kb_chat(
     async def knowledge_base_chat_iterator(
             query: str,
             model_name: str = LLM_MODELS[0],
-            model_name1: str = LLM_MODELS[1],
+            model_name1: str = LLM_MODELS[0],
             prompt_name: str = "self_default",
     ) -> AsyncIterable[str]:
         nonlocal fileNames, history