Ruff fix

src/mood/mood_manager.py

@@ -1,10 +1,7 @@
-import math
-import random
 import time
 
 from src.common.logger import get_logger
 from src.config.config import global_config, model_config
-from src.chat.message_receive.message import MessageRecv
 from src.chat.message_receive.chat_stream import get_chat_manager
 from src.chat.utils.prompt_builder import Prompt, global_prompt_manager
 from src.chat.utils.chat_message_builder import build_readable_messages, get_raw_msg_by_timestamp_with_chat_inclusive