- 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.
