Update README to reflect project maintenance status

Added a note indicating that the project is no longer maintained and suggests using an alternative repository.

Author: Rhilip

README.md

@@ -1,3 +1,6 @@
+> [!NOTE]
+> 本项目已停止维护，对 Cloudflare Worker 版本，建议使用 https://github.com/rabbitwit/PT-Gen-Refactor
+
 # PT-Gen on Cloudflare Worker
 [![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2FRhilip%2Fpt-gen-cfworker.svg?type=shield)](https://app.fossa.io/projects/git%2Bgithub.com%2FRhilip%2Fpt-gen-cfworker?ref=badge_shield)
 [![Build Status](https://github.com/Rhilip/pt-gen-cfworker/actions/workflows/build.yml/badge.svg)](https://github.com/Rhilip/pt-gen-cfworker/actions/workflows/build.yml)