如何在Laravel中创建和自定义传递渠道通知，如数据库和电子邮件？

php artisan make:notification CustomNotification

public function via($notifiable)
{
    return ['database', 'mail'];
}

public function toMail($notifiable)
{
    return (new MailMessage)
                ->subject('Custom Notification')
                ->line('This is a custom notification.')
                ->action('Notification Action', url('/'))
                ->line('Thank you for using our application!');
}

public function routeNotificationForMail()
{
    return $this->email;
}

public function routeNotificationForDatabase()
{
    return $this->id;
}

$user = User::find(1);
$user->notify(new CustomNotification);