BetterAuth to implement multi-user support, roles, external auth providers

⚠️ Please verify that your question has not already been reported

• I have searched the existing issues and found no similar reports.

🛡️ Security Policy

• I have read and agree to Uptime Kuma's Security Policy.

📝 Describe your problem

Hi, There was a lot of conversations about mutli-users support, roles, external providers, etc. I would like to know the final decision to work (or let some other) works on the implementation.

I saw https://github.com/louislam/uptime-kuma/pull/6161#issuecomment-3390762507, so would we go on BetterAuth?

I already worked on https://github.com/louislam/uptime-kuma/pull/3571#issuecomment-3008676597, so the tests could be easy to be re-implemented).