FEAT(traefik): add per-application ingress managem

- Added ingress.yaml for code-server, kubernetes-dashboard, and umami
- Updated kustomization files to include ingress resources
- Migrated from centralized ingress management to per-app architecture

code-server/kustomization.yaml

@@ -6,3 +6,4 @@ resources:
   # - argocd/code-server.yaml
   - vault/code-server-password.yaml
   - rbac.yaml
+  - ingress.yaml