feat(apps): onboard pihole via renderer + --no-image-automation flag (WS-APPS golden path)

First app onboarded through catalog/render.py -> apps/. Added --no-image-automation so apps
deploy before the Flux image controllers exist (L1 goldens keep the default, unchanged).
KNOWN GAP surfaced: exposed apps get default-deny (ingress: []) with no gateway-ingress allow,
so the HTTPRoute path is blocked — renderer/WS-NET follow-up to allow Cilium gateway ingress
to services with an exposure/HTTPRoute.

apps/kustomization.yaml

@@ -0,0 +1,9 @@
+---
+# Onboarded services (WS-APPS). Each app is rendered from its catalog/ ServiceDefinition by
+# catalog/render.py and committed here; the `apps` Flux Kustomization (clusters/base/apps.yaml,
+# dependsOn platform-config) reconciles this directory. Image-automation CRs are omitted for now
+# (--no-image-automation) until the Flux image controllers are installed.
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - pihole.yaml

apps/pihole.yaml

@@ -0,0 +1,174 @@
+---
+# Namespace (trust zone; default-deny + policies apply)
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: pihole
+  labels:
+    homelab.keithjackson.dev/app-namespace: 'true'
+    gateway-access: shared
+  annotations:
+    homelab.keithjackson.dev/backup-policy: daily-offcluster
+---
+# Default-deny baseline (R-NET-01): deny all, allow only DNS
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: default-deny
+  namespace: pihole
+  labels:
+    homelab.keithjackson.dev/baseline: default-deny
+spec:
+  podSelector: {}
+  policyTypes:
+  - Ingress
+  - Egress
+  ingress: []
+  egress:
+  - to:
+    - namespaceSelector:
+        matchLabels:
+          kubernetes.io/metadata.name: kube-system
+    ports:
+    - protocol: UDP
+      port: 53
+    - protocol: TCP
+      port: 53
+---
+# PVC pihole-config (R-STATE)
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: pihole-config
+  namespace: pihole
+  labels:
+    app.kubernetes.io/name: pihole
+spec:
+  accessModes:
+  - ReadWriteOnce
+  storageClassName: longhorn
+  resources:
+    requests:
+      storage: 2Gi
+---
+# Deployment (R-PLAT-02)
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: pihole
+  namespace: pihole
+  labels:
+    app.kubernetes.io/name: pihole
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: pihole
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: pihole
+        homelab.keithjackson.dev/egress-class: internet
+        homelab.keithjackson.dev/auth-mode: forward-auth
+      annotations:
+        homelab.keithjackson.dev/auth-mode: forward-auth
+        homelab.keithjackson.dev/auth-groups: platform-admins
+    spec:
+      containers:
+      - name: pihole
+        image: pihole/pihole
+        ports:
+        - containerPort: 80
+        volumeMounts:
+        - name: config
+          mountPath: /data/config
+      volumes:
+      - name: config
+        persistentVolumeClaim:
+          claimName: pihole-config
+---
+# Service
+apiVersion: v1
+kind: Service
+metadata:
+  name: pihole
+  namespace: pihole
+  labels:
+    app.kubernetes.io/name: pihole
+spec:
+  selector:
+    app.kubernetes.io/name: pihole
+  ports:
+  - name: port-80
+    port: 80
+    targetPort: 80
+---
+# HTTPRoute pihole-80 (R-TLS/R-DNS)
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: pihole-80
+  namespace: pihole
+  labels:
+    app.kubernetes.io/name: pihole
+  annotations:
+    homelab.keithjackson.dev/auth-mode: forward-auth
+    homelab.keithjackson.dev/auth-groups: platform-admins
+spec:
+  parentRefs:
+  - name: shared
+    namespace: gateway
+    sectionName: https
+  hostnames:
+  - pihole.home.keithjackson.dev
+  rules:
+  - matches:
+    - path:
+        type: PathPrefix
+        value: /
+    backendRefs:
+    - name: pihole
+      port: 80
+---
+# ServiceMonitor (R-OBS-01)
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: pihole
+  namespace: pihole
+  labels:
+    release: kube-prometheus-stack
+    app.kubernetes.io/name: pihole
+spec:
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: pihole
+  namespaceSelector:
+    matchNames:
+    - pihole
+  endpoints:
+  - port: metrics
+    interval: 30s
+---
+# PrometheusRule SLI alerts (R-OBS-01)
+apiVersion: monitoring.coreos.com/v1
+kind: PrometheusRule
+metadata:
+  name: pihole-slis
+  namespace: pihole
+  labels:
+    release: kube-prometheus-stack
+    app.kubernetes.io/name: pihole
+spec:
+  groups:
+  - name: pihole.slis
+    rules:
+    - alert: pihole-down
+      expr: up{job="pihole"} == 0
+      for: 5m
+      labels:
+        severity: critical
+        service: pihole
+      annotations:
+        summary: pihole is down
+        description: 'pihole has been unreachable for 5m (SLI: up).'