fix ruff

src/common/server.py

@@ -1,5 +1,5 @@
 from fastapi import FastAPI, APIRouter
-from typing import Optional, Union
+from typing import Optional
 from uvicorn import Config, Server as UvicornServer
 import os
 

src/plugins/chat_module/reasoning_chat/reasoning_generator.py

@@ -2,10 +2,9 @@ import time
 from typing import List, Optional, Tuple, Union
 import random
 
-from ....common.database import db
 from ...models.utils_model import LLM_request
 from ...config.config import global_config
-from ...chat.message import MessageRecv, MessageThinking
+from ...chat.message import MessageThinking
 from .reasoning_prompt_builder import prompt_builder
 from ...chat.utils import process_llm_response
 from src.common.logger import get_module_logger, LogConfig, LLM_STYLE_CONFIG

src/plugins/chat_module/think_flow_chat/think_flow_generator.py

@@ -1,11 +1,10 @@
 import time
-from typing import List, Optional, Tuple, Union
+from typing import List, Optional
 
 
-from ....common.database import db
 from ...models.utils_model import LLM_request
 from ...config.config import global_config
-from ...chat.message import MessageRecv, MessageThinking
+from ...chat.message import MessageRecv
 from .think_flow_prompt_builder import prompt_builder
 from ...chat.utils import process_llm_response
 from src.common.logger import get_module_logger, LogConfig, LLM_STYLE_CONFIG