[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/gen_title.py

@@ -19,7 +19,7 @@ async def gen_title(
                                             "content": "我们来玩成语接龙，我先来，生龙活虎"},
                                             {"role": "assistant", "content": "虎头虎脑"}]]
                                         ),
-            model_name: Optional[str] = Body(LLM_MODELS[1], description="LLM 模型名称。"),
+            model_name: Optional[str] = Body(LLM_MODELS[0], description="LLM 模型名称。"),
 ):
     """
     根据一轮对话历史生成简洁标题\n
@@ -32,7 +32,7 @@ async def gen_title(
     if model_name == "R1-70B":
         model_name = DEEPSEEK_MODELS[1]
     elif model_name == "QIANWEN":
-        model_name = LLM_MODELS[1]
+        model_name = LLM_MODELS[0]
     else:
         model_name = model_name