feat(k8s): add K8s manifests for all homelab services

traefik, gitea, adguard, nextcloud, errorpages, homepages,
uptime-kuma, kener, checkmk, headscale, dockmon, metube,
downtify, portainer, netronome, userbot

Includes Helm values, deployments, services, ingress routes,
configmaps, secrets (placeholders), postgres statefulsets,
kustomize overlays, and Traefik dynamic configuration.

nextcloud/k8s/servers-transport.yaml

@@ -0,0 +1,7 @@
+apiVersion: traefik.io/v1alpha1
+kind: ServersTransport
+metadata:
+  name: insecure-transport
+  namespace: nextcloud
+spec:
+  insecureSkipVerify: true