feat: migrate cattle-system (Rancher) from Terraform to ArgoCD

- Add cattle-system base ArgoCD application with namespace, Vault integration, and ingress
- Create cattle-system overlay for au-syd1 with Rancher Helm chart configuration
- Update platform ApplicationSet to include cattle-system deployment
- Update platform project to include Rancher Helm repository as source
- Configure Rancher v2.13.1 with HA, TLS, audit logging, and bootstrap secret from Vault
- Maintain one-to-one migration from Terraform configuration

.woodpecker/kubeconform.yaml

@@ -3,6 +3,6 @@ when:
 
 steps:
   - name: kubeconform
-    image: git.unkin.net/unkin/almalinux9-kubetest:20260319
+    image: git.unkin.net/unkin/almalinux9-kubetest:20260308
     commands:
       - make kubeconform