Update Go module path from Gitea to GitHub

Change module path from:
  gitea.engen.priv.no/klauvsteinen/unifi-network-operator
To:
  github.com/vegardengen/unifi-network-operator

This fixes the module path mismatch error in GitHub Actions.

Changes:
- Updated go.mod module declaration
- Updated all import statements in Go files
- Updated kustomization and ko config files
- Ran go mod tidy to update dependencies

This is required for the project to build correctly on GitHub.

internal/controller/firewallgroup_controller_test.go

@@ -27,7 +27,7 @@ import (
 
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 
-	unifiv1beta1 "gitea.engen.priv.no/klauvsteinen/unifi-network-operator/api/v1beta1"
+	unifiv1beta1 "github.com/vegardengen/unifi-network-operator/api/v1beta1"
 )
 
 var _ = Describe("FirewallGroup Controller", func() {