PERF(repo): add PriorityClasses for workloads

- Create high-priority (1000) for critical infra
- Create medium-priority (500) for observability
- Create low-priority (100) as global default

kustomization.yaml

@@ -6,6 +6,7 @@ resources:
   - application.yaml
 
   # Core infrastructure
+  - priority-classes/argocd.yaml
   - cert-manager/argocd.yaml
   - traefik/argocd.yaml
   - argocd-image-updater/argocd.yaml