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.

adguardhome/k8s/adguard.yaml

@@ -0,0 +1,85 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: adguard-service
+  namespace: adguard
+spec:
+  selector:
+    app: adguard
+  ports:
+  - port: 3000
+    name: webui
+    targetPort: 3000
+  - port: 53
+    name: dns
+    targetPort: 53
+    protocol: UDP
+  - port: 53
+    name: dns-tcp
+    targetPort: 53
+    protocol: TCP
+  - port: 853
+    name: dot
+    targetPort: 853
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: adguard-deployment
+  namespace: adguard
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: adguard
+  template:
+    metadata:
+      labels:
+        app: adguard
+    spec:
+      containers:
+      - name: adguard
+        image: adguard/adguardhome:latest
+        resources:
+          limits:
+            memory: "1Gi"
+            cpu: "500m"
+          requests:
+            memory: "128Mi"
+            cpu: "50m"
+        ports:
+        - containerPort: 3000
+          name: webui
+        - containerPort: 53
+          name: dns
+        - containerPort: 853
+          name: dot
+        volumeMounts:
+        - name: adguard-data
+          mountPath: /opt/adguardhome/work
+          subPath: work
+        - name: adguard-data
+          mountPath: /opt/adguardhome/conf
+          subPath: conf
+        - name: adguard-certs
+          mountPath: /certs
+          readOnly: true
+      volumes:
+      - name: adguard-data
+        persistentVolumeClaim:
+          claimName: adguard-pvc
+      - name: adguard-certs
+        secret:
+          secretName: adguard-certs
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: adguard-pvc
+  namespace: adguard
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 2Gi