registrobr/whmcs-registrobr-epp — reverse-engineered prompt

I want a WHMCS registrar module that lets my WHMCS install talk to Registro.br over EPP so I can manage .br domains from the billing panel instead of doing everything by hand.

Please make it feel like a normal registrar integration for staff and customers. It should cover the basic domain lifecycle for .br names, like registering new domains, renewals, transfers if supported, checking availability or status, and syncing domain details with Registro.br. I also need the usual admin settings so I can enter the Registro.br connection credentials and turn the module on without hacking core files.

Please use the project docs that are already here for how it should be installed and used, and look up current WHMCS and Registro.br EPP docs online if you need to. Keep it practical, working, and easy to drop into a real WHMCS setup, with clear setup notes and any important warnings if something depends on the server environment.