FIX(argocd): use control-plane nodeSelector

- Change nodeSelector from master to control-plane
- K8s nodes have control-plane: "true" label
- Fix pod scheduling failure

FIX(argocd): use hostname instead of hosts for ingress

- Change from hosts array to hostname string
- Change tls from array to boolean
- Matches argo-cd Helm chart expected format

FIX(argocd): resolve SharedResourceWarning

- Change from including argocd/ folder to argocd/argocd.yaml only
- Namespace and webhook-ingress now managed by argocd app only
- Prevents duplicate resource management between platform and argocd

kustomization.yaml

@@ -10,5 +10,5 @@ resources:
   # ArgoCD Image Updater
   - argocd-image-updater/argocd.yaml
 
-  # ArgoCD configuration (no Application, just configuration)
-  - argocd
+  # ArgoCD self-management Application
+  - argocd/argocd.yaml