🐛 fix(command): 修复 plugin.py 引用已删除的 COMMAND_LENGTH 导致启动报错

- 导入改为 COMMAND_LENGTH_MIN / COMMAND_LENGTH_MAX
- 启动日志适配范围格式 %d~%d

plugin.py

@@ -7,7 +7,7 @@ import os
 from aiohttp import web
 from ncatbot.plugin import NcatBotPlugin
 
-from .config import COMMAND_CALLBACK_URL, COMMAND_LENGTH, COMMAND_PREFIX, HOST, PORT, UPLOAD_DIR, WEBHOOK_API_KEY
+from .config import COMMAND_CALLBACK_URL, COMMAND_LENGTH_MAX, COMMAND_LENGTH_MIN, COMMAND_PREFIX, HOST, PORT, UPLOAD_DIR, WEBHOOK_API_KEY
 from .handlers.command import parse_command, send_command_callback
 from .handlers.health import health_handler
 from .handlers.message import webhook_handler
@@ -32,7 +32,7 @@ class WebHookPlugin(NcatBotPlugin):
     async def on_load(self):
         self.logger.info("Webhook 插件已加载")
         self.logger.info("WEBHOOK_API_KEY: %s", "已配置" if os.environ.get("WEBHOOK_API_KEY") else "自动生成")
-        self.logger.info("命令监听: 前缀=%s 长度=%d 回调=%s", COMMAND_PREFIX, COMMAND_LENGTH,
+        self.logger.info("命令监听: 前缀=%s 长度=%d~%d 回调=%s", COMMAND_PREFIX, COMMAND_LENGTH_MIN, COMMAND_LENGTH_MAX,
                          COMMAND_CALLBACK_URL or "未配置")
         asyncio.create_task(self._start_webhook())
         self._cleanup_task = asyncio.create_task(self._cleanup_loop())