fix: kustomization syntax + add RBAC for new namespaces

- Fix sops-secrets kustomization: use generatorOptions instead of
  per-generator disableNameSuffixHash (invalid field)
- Add RoleBindings for portfolio, poimen, dashboard namespaces
  so authentik-provisioner can create secrets there

k8s/argocd/secrets/kustomization.yaml

@@ -1,9 +1,10 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 
-secretGenerator:
-  - name: portfolio-secrets
-    namespace: portfolio
-    disableNameSuffixHash: true
-    envs:
-      - portfolio-secrets.enc.env
+# Disable hash suffix for all generated secrets (stable names)
+generatorOptions:
+  disableNameSuffixHash: true
+
+# SOPS-encrypted secrets via ksops generator
+generators:
+  - secret-generator.yaml