Add Native k3s Support

[superadmin7]

It would be great if Dokploy could support deploying applications directly to a k3s cluster. k3s is lightweight, production-ready, and fully Kubernetes-compatible. Many self-hosted users choose k3s because it is simpler than a full Kubernetes installation while still providing the Kubernetes ecosystem. Native k3s support would make it easier for users to start with Dokploy and later scale their infrastructure without migrating to a different platform.