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.

headscale/k8s/headplane-config.yaml

@@ -0,0 +1,28 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: headplane-config
+  namespace: headscale
+data:
+  config.yaml: |
+    server:
+      host: "0.0.0.0"
+      port: 3000
+      base_url: https://hs.forust.xyz
+      cookie_secure: true
+      cookie_max_age: 86400
+      data_path: "/var/lib/headplane"
+    headscale:
+      url: "http://headscale-service:8080"
+      config_path: "/etc/headscale/config.yaml"
+      config_strict: true
+    integration:
+      docker:
+        enabled: true
+        container_label: "me.tale.headplane.target=headscale"
+        container_name: "headscale"
+        socket: "unix:///var/run/docker.sock"
+      kubernetes:
+        enabled: false
+      proc:
+        enabled: false