[NS : suangsuang] 阿里云 CDT 抢占式实例的单机保活 + 多机联合换班，Cloudflare版

https://github.com/suangsuang888/cdt-management-workersDDNS +通知。DDNS+通知。这是BeacherZ/cdt-management（Python+FastAPI+SQLite+Docker）的TypeScript移植版，跑在CloudflareWorke