feat: shutdown when task queue empty

module/config/i18n/en-US.json

@@ -224,7 +224,8 @@
       "help": "Close AL when there are no pending tasks, can help reduce CPU",
       "stay_there": "Stay There",
       "goto_main": "Goto Main Page",
-      "close_game": "Close Game"
+      "close_game": "Close Game",
+      "shutdown": "Shutdown"
     }
   },
   "Cafe": {

module/config/i18n/zh-CN.json

@@ -224,7 +224,8 @@
       "help": "无任务时关闭游戏，能在收菜期间降低 CPU 占用",
       "stay_there": "停在原处",
       "goto_main": "前往主界面",
-      "close_game": "关闭游戏"
+      "close_game": "关闭游戏",
+      "shutdown": "shutdown"
     }
   },
   "Cafe": {