feat: support dify in rag module (#550)

Co-authored-by: Willem Jiang <willem.jiang@gmail.com>

src/llms/llm.py

@@ -10,7 +10,6 @@ from langchain_core.language_models import BaseChatModel
 from langchain_deepseek import ChatDeepSeek
 from langchain_google_genai import ChatGoogleGenerativeAI
 from langchain_openai import AzureChatOpenAI, ChatOpenAI
-from typing import get_args
 
 from src.config import load_yaml_config
 from src.config.agents import LLMType

src/llms/providers/dashscope.py

@@ -211,7 +211,6 @@ class ChatDashscope(ChatOpenAI):
                 and hasattr(response.choices[0], "message")
                 and hasattr(response.choices[0].message, "reasoning_content")
             ):
-
                 reasoning_content = response.choices[0].message.reasoning_content
                 if reasoning_content and chat_result.generations:
                     chat_result.generations[0].message.additional_kwargs[