Adds an optional kv_read_paths list to the app_policy module (default []) so an
app's env=prod runtime policy can read extra kvv2 data paths — e.g. a shared
backup-creds path owned by another app. Plumbed through the root applications
schema + module call (dynamic rule, read+list).
Set for erp: kv_read_paths = ["kvv2/data/longhorn/gcs-backup"], so the dedicated
Dolibarr backup CronJob (erp chart, gated) can read the existing GCS HMAC creds
via its own VaultStaticSecret instead of borrowing the Longhorn secret
cross-namespace or duplicating credentials.
No-op for every other app (default []). Only the `erp` runtime policy gains one
read+list rule.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
