Custom Card in Laravel Nova - Service Provider 2

NovaServiceProvider.php

<?php

// ...

protected function routes()
{
  Nova::routes()
    ->withAuthenticationRoutes()
    ->withPasswordResetRoutes()
    ->register();
    
  Route::middleware(['nova'])
    // Set this namespace wherever you want to respond 
    // to requests from your Nova components.
    ->namespace('App\Nova\Http\Controllers')
    ->prefix('nova-backend')
    ->group(base_path('routes/nova.php'));
}

// ...