feat(homarr): complete wiring for landing page deployment

Adds Homarr landing page with Authentik SSO:
- k8s/argocd/apps/60-applications.yaml: multi-source Application (homarr
  chart from homarr-labs + in-repo values), ns dashboard, wave 8
- k8s/bootstrap/ingress/ingress.yaml: homarr.riotpiao.com → dashboard/homarr:3000
- k8s/bootstrap/coredns/coredns-configmap.yaml: rewrite homarr.riotpiao.com
  to ingress controller
- k8s/security/iam/scripts/authentik-provision.py: added 'homarr' to SERVICES
  (generates OAuth provider/app + homarr-oidc secret with client-id/secret)
- k8s/security/iam/rbac-dashboard-rolebinding.yaml: grants authentik-provisioner
  SA access to dashboard ns for secret management
- k8s/security/iam/kustomization.yaml: includes new RoleBinding

Homarr now fully wired:
- Ingress: https://homarr.riotpiao.com
- SSO: redirects to Authentik, login as rock
- Persistence: 5Gi RWO on longhorn-wffc (3-replica HA)
- Tile config: UI-managed (saved to PVC)

k8s/argocd/apps/60-applications.yaml

@@ -132,3 +132,32 @@ spec:
       selfHeal: true
     syncOptions:
       - CreateNamespace=true
+---
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: homarr
+  namespace: argocd
+  annotations:
+    argocd.argoproj.io/sync-wave: "8"
+spec:
+  project: homelab
+  sources:
+    - repoURL: https://homarr-labs.github.io/charts
+      chart: homarr
+      targetRevision: "*"
+      helm:
+        valueFiles:
+          - $values/k8s/applications/homarr/homarr-values.yaml
+    - repoURL: https://forgejo.riotpiao.com/riotpiao.com/homelab.git
+      targetRevision: main
+      ref: values
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: dashboard
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true