qg5/telegram-username-sniper ? reverse-engineered prompt

Build me a small Go app that watches a list of Telegram usernames and tries to grab them the moment they become available.

I want it to check availability through Fragment, then automatically claim the username with Telegram using my own account, or create a channel and claim it there if that is the better option. It should support adding multiple usernames, skip ones it has already tried, and keep working even after I close it by saving the Telegram login session locally.

Make the setup simple with a config file for my phone number, api id, api hash, the claim mode, how often it checks, and the usernames to watch. I also want an interactive login flow the first time it runs, clear console logs, and sensible handling for rate limits so it does not hammer Telegram too hard. If you need to look up current Telegram or Fragment details online, go ahead.