adapted to v5 namespaces, methods

[s-ohnishi]

Reflect namespace and method name changes. The part that uses the database of Invo matches the setting of Invo.

I don't know why the routing is like this, or why the layout doesn't reflect the output from the controller, so I didn't change them.

[engeen-nl]

You're a genius, thank you so much! At least for me your fix on the mvc/simple-volt/ demo application is a working starting point / sample application that runs on a new litespeed + php 8.3 + phalcon 5.9 installation.