PVC name is now immutable — hardcoded in all 4 deployment templates instead
of being a configurable Helm value. Removed pvcName from values.yaml and
--set pvcName from deploy.sh. This ensures the PVC can never be renamed or
deleted by Helm operations, only manually via kubectl.
- deploy.sh: keep failed release for debugging instead of auto-uninstall,
add helm.sh/resource-policy=keep annotation on ConfigMap and PVC
- uninstall.sh: interactive confirmation with protected resource list,
post-uninstall verification that namespace/ConfigMap/PVC still exist
ConfigMap values are in seconds (e.g. connection_timeout=30 means 30s),
but Duration::from_millis() interpreted them as ms (30ms), causing pool
timeout on startup. Changed to from_secs(). Also removed Namespace from
Helm chart to prevent cascade deletion of PVC/ConfigMap on uninstall.
