Add vaultwarden app (migrated from docker on 10.10.0.5)

- Pinned to 1.37.0 so the migration is not also an upgrade
- ADMIN_TOKEN rotated to an Argon2id PHC string, stored as a SealedSecret.
  The old token was plaintext AND set in config.json, which overrides env --
  both that key and signups_allowed were removed during migration so the
  Deployment is the source of truth. signups had been silently enabled.
- /admin keeps Authentik forward-auth at priority 1000 (Traefik's default
  priority is rule length; the old docker router used 10 vs an implicit 24
  and was therefore bypassed).
- vault.aleshym.co stays private: absent from the k3s public catchall and
  from the Docker Traefik wan entrypoint.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

apps/vaultwarden/kustomization.yaml

@@ -0,0 +1,11 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - namespace.yaml
+  - vaultwarden-sealedsecret.yaml
+  - vaultwarden-pvc.yaml
+  - vaultwarden-deployment.yaml
+  - vaultwarden-service.yaml
+  - vaultwarden-ingress.yaml
+  - vaultwarden-admin.yaml