fix(plugin): fix reloadp command not taking effect

- Use write_plugin_config() instead of directly modifying plugin_config dict
- Add remove_plugin_config() to clear plugin config before reload
- Update plugins to use pconf() and write_plugin_config() for better config management

plugins/plugin.py

@@ -1,6 +1,6 @@
 import os
 import json
-from config import pconf, plugin_config, conf
+from config import pconf, plugin_config, conf, write_plugin_config
 from common.log import logger
 
 
@@ -24,13 +24,13 @@ class Plugin:
                     plugin_conf = json.load(f)
 
                 # 写入全局配置内存
-                plugin_config[self.name] = plugin_conf
+                write_plugin_config({self.name: plugin_conf})
         logger.debug(f"loading plugin config, plugin_name={self.name}, conf={plugin_conf}")
         return plugin_conf
 
     def save_config(self, config: dict):
         try:
-            plugin_config[self.name] = config
+            write_plugin_config({self.name: config})
             # 写入全局配置
             global_config_path = "./plugins/config.json"
             if os.path.exists(global_config_path):