Backend Build for Tour App

I have an audio-guided walking-tour web app that currently lives as a fully static bundle (HTML, CSS, vanilla JS). It’s time to give it a proper server side. What I need you to do • Authentication – Add email registration and login, Google social login, and a standard “forgot password” flow... (Budget: €8 - €30 EUR, Jobs: API Development, Backend Development, Database Management, HTML, JavaScript, MySQL, PHP, PostgreSQL)