Remove unused import

robot.py

@@ -16,7 +16,6 @@ from base.func_chengyu import cy
 from base.func_news import News
 from base.func_tigerbot import TigerBot
 from base.func_xinghuo_web import XinghuoWeb
-from base.func_bard import BardAssistant
 from configuration import Config
 from constants import ChatType
 from job_mgmt import Job