refactor(notification): 重构 PushPlusPlus 通知提供商

- 删除 PushPlusPlus 类和相关组件
- 新增 PushPlus 类和组件
- 更新通知提供商列表和相关配置
- 修改国际化文案，将 PushPlusPlus 改为 PushPlus

server/notification.js

@@ -39,7 +39,7 @@ const PromoSMS = require("./notification-providers/promosms");
 const Pushbullet = require("./notification-providers/pushbullet");
 const PushDeer = require("./notification-providers/pushdeer");
 const Pushover = require("./notification-providers/pushover");
-const PushPlusPlus = require("./notification-providers/pushplusplus");
+const PushPlus = require("./notification-providers/pushplus");
 const Pushy = require("./notification-providers/pushy");
 const RocketChat = require("./notification-providers/rocket-chat");
 const SerwerSMS = require("./notification-providers/serwersms");
@@ -129,7 +129,7 @@ class Notification {
             new Pushbullet(),
             new PushDeer(),
             new Pushover(),
-            new PushPlusPlus(),
+            new PushPlus(),
             new Pushy(),
             new RocketChat(),
             new ServerChan(),