feat: add WPUSH notification provider (#3066)

Add WPUSH as a notification channel for Qinglong panel settings and
sample notify scripts (Python/JS), using POST https://api.wpush.cn/api/v1/send
with success code === 0. Supports optional channel and topic_code.

src/locales/en-US.json

@@ -661,5 +661,8 @@
   "失败次数": "Failure count",
   "最新日志": "Latest log",
   "加载失败": "Failed to load",
-  "重试": "Retry"
+  "重试": "Retry",
+  "WPUSH的API Key，在 https://wpush.cn/settings 获取，参考 https://wpush.cn/docs": "WPUSH API Key from https://wpush.cn/settings, see https://wpush.cn/docs",
+  "推送渠道，支持 wechat/app/sms/mail/webhook/dingtalk/feishu/wechat_work/clawbot/qqbot，默认 wechat": "Channel: wechat/app/sms/mail/webhook/dingtalk/feishu/wechat_work/clawbot/qqbot, default wechat",
+  "可选，Topic 广播编码；填写后按 Topic 推送，参考 https://wpush.cn/docs": "Optional Topic code for broadcast; see https://wpush.cn/docs"
 }