miantiao-me/BroadcastChannel ? reverse-engineered prompt

Build me a simple website that turns my public Telegram channel into a clean microblog.

It should pull posts from a channel username I give it, show them in a nice blog style feed, and include things like a homepage, post pages, tags or links if they exist, and a lightweight profile area for social links. I want it to be SEO friendly, with a sitemap, RSS feed, and RSS JSON, and it should work fast with no JavaScript on the browser side.

Please make it easy to customize with a few settings like language, timezone, theme, and optional header or footer text. I’d also like it to be ready to deploy on common serverless platforms like Cloudflare Workers, Vercel, or Netlify, and work from environment variables so I can change the Telegram channel without touching the code.