Remove unused imports across multiple modules

Cleaned up various files by removing unused or redundant import statements to improve code readability and reduce potential confusion. No functional changes were made.

src/main.py

@@ -16,7 +16,6 @@ from src.common.server import get_global_server, Server
 from src.mood.mood_manager import mood_manager
 from rich.traceback import install
 from src.manager.schedule_manager import schedule_manager
-from src.common.cache_manager import tool_cache
 # from src.api.main import start_api_server
 
 # 导入新的插件管理器和热重载管理器