<Perl>
        $ENV{PLACK_ENV} = 'production';
        $ENV{MOJO_HOME} = '/var/www/MezlApp';
        $ENV{MOJO_MODE} = 'deployment';
    </Perl>
[download]

This has no effect whatsoever; Apache won't even start a perl process for you. After all you configured a reverse proxy, not a perl launcher.

Update: you do seem to set up a perl launcher, but for the location as the reverse proxy. Don't do that.

So, my advice: start your app the way you usually do, but use hypnotoad instead of morbo - no other changes so far.

Then test the app with your browser, connecting to hypnotoad directly, not to Apache. Only when that works, you start your apache and try to ues the reverse proxy.

That way you can cleanly separate debugging hypnotoad startup from the reverse proxy.