删除老代码，迁移部分文件

plugins/message_summary/main.py

@@ -4,10 +4,10 @@ from typing import Dict, Any, Tuple, Optional, List
 import requests
 
 from message_storage.message_to_db import MessageStorage
-from message_summary.compress_chat_data import compress_chat_data
-from message_summary.markdown_to_image import convert_md_str_to_image
+from compress_chat_data import compress_chat_data
 from plugin_common.message_plugin_interface import MessagePluginInterface
 from plugin_common.plugin_interface import PluginStatus
+from plugins.message_summary.markdown_to_image import convert_md_str_to_image
 from plugins.stats_collector.decorators import plugin_stats_decorator
 from robot_cmd.robot_command import GroupBotManager, Feature, PermissionStatus