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.

.gitignore

@@ -94,6 +94,10 @@ temp/*
 
 # Environment 
 .env
+
+# kubernetes
+*/k8s/*secret*
+!*/k8s/*secret*.example
 .env.anna
 .env.forust
 .env.*