feat(adguard,traefik,cert-manager,reloader): foundation for adguard cert sync

- traefik: enable kubernetesIngress provider (needed for cert-manager HTTP-01)
- adguard: add reloader auto annotation for secret-driven restarts
- cert-manager: namespace, helm values (crds), staging+prod ClusterIssuers
- reloader: namespace manifest

cert-manager/k8s/namespace.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: cert-manager