If you're interested in exploring MVCMS-Lite further, here are some resources to get you started:
He called it mvcms-lite . The name was ironic, because it wasn’t really MVC. It was just him, a SQLite file, a few PHP routes, and a single CSS file he’d copied from a 2016 tutorial. No build step. No Docker. No AI autocomplete second-guessing his semicolons. mvcms-lite
In /app/Controllers/ProductController.php : If you're interested in exploring MVCMS-Lite further, here
The core App.php parses the URL to decide which controller to load: a SQLite file
The Controller acts as the traffic cop. It is the only entry point for the application, handling URI routing and business logic.