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.

uptime-kuma/k8s/uptime-kuma.yaml

@@ -0,0 +1,61 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: uptime-kuma-service
+  namespace: uptime-kuma
+spec:
+  selector:
+    app: uptime-kuma
+  ports:
+  - port: 3001
+    targetPort: 3001
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: uptime-kuma-deployment
+  namespace: uptime-kuma
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: uptime-kuma
+  template:
+    metadata:
+      labels:
+        app: uptime-kuma
+    spec:
+      containers:
+      - name: uptime-kuma
+        image: louislam/uptime-kuma:2
+        resources:
+          limits:
+            memory: "3Gi"
+            cpu: "1"
+          requests:
+            memory: "512Mi"
+            cpu: "100m"
+        ports:
+        - containerPort: 3001
+        volumeMounts:
+        - name: uptime-kuma-data
+          mountPath: /app/data
+      volumes:
+      - name: uptime-kuma-data
+        persistentVolumeClaim:
+          claimName: uptime-kuma-pvc
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: uptime-kuma-pvc
+  namespace: uptime-kuma
+spec:
+  resources:
+    requests:
+      storage: 2Gi
+  volumeMode: Filesystem
+  accessModes:
+    - ReadWriteOnce
+
+