集成help以及init到core内，修改baseplugin为plugin

core/command_manager.py

@@ -29,6 +29,34 @@ class CommandManager:
         self.request_handlers: List[Dict] = []  # 存储请求处理器
         self.plugins: Dict[str, Dict[str, Any]] = {}  # 存储插件元数据
 
+        # --- 内置 help 指令 ---
+        self.commands["help"] = self._help_command
+        self.plugins["core.help"] = {
+            "name": "帮助",
+            "description": "显示所有可用指令的帮助信息",
+            "usage": "/help",
+        }
+
+    async def _help_command(self, bot, event):
+        """
+        内置的 /help 指令处理器
+
+        :param bot: Bot 实例
+        :param event: 消息事件对象
+        """
+        help_text = "--- 可用指令列表 ---\n"
+        
+        for plugin_name, meta in self.plugins.items():
+            name = meta.get("name", "未命名插件")
+            description = meta.get("description", "暂无描述")
+            usage = meta.get("usage", "暂无用法说明")
+            
+            help_text += f"\n{name}:\n"
+            help_text += f"  功能: {description}\n"
+            help_text += f"  用法: {usage}\n"
+            
+        await bot.send(event, help_text.strip())
+
     # --- 1. 消息指令装饰器 ---
     def command(self, name: str):
         """