feat(sso): complete MinIO OIDC env + add Homarr landing page base config

MinIO (Part B):
- k8s/infrastructure/minio/minio-tenant.yaml: added full OIDC env block
  (CONFIG_URL, CLIENT_ID, CLIENT_SECRET from minio-oidc secret, CLAIM_NAME,
  REDIRECT_URI, DISPLAY_NAME, SCOPES) — MinIO console SSO login will now work

Homarr (Part C1 - base):
- k8s/applications/homarr/homarr-values.yaml: official chart config with
  Authentik SSO (AUTH_PROVIDERS=oidc, all OIDC env vars, client creds from
  homarr-oidc secret, SECRET_ENCRYPTION_KEY from SOPS secret)
- k8s/applications/homarr/homarr-secrets.enc.yaml: age-encrypted
  SECRET_ENCRYPTION_KEY (stable key — rotating it breaks saved integrations)
- k8s/applications/homarr/kustomization.yaml: namespace dashboard

Still TODO for Homarr:
- Add 'homarr' to authentik-provision.py SERVICES dict
- Add Application to 60-applications.yaml (multi-source: chart + values)
- Add ingress rule (k8s/bootstrap/ingress/ingress.yaml)
- Add CoreDNS rewrite (k8s/bootstrap/coredns/coredns-configmap.yaml)
- Add dashboard RoleBinding for authentik-provisioner SA

k8s/applications/homarr/kustomization.yaml

@@ -0,0 +1,7 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+namespace: dashboard
+resources:
+  - homarr-secrets.enc.yaml
+# Homarr deployed via Helm chart (values in 60-applications.yaml multi-source Application).
+# This kustomization just holds the SOPS-encrypted SECRET_ENCRYPTION_KEY.