PVE login

The plugin requests an API token with a one-hour expiry and deletes that token on shutdown using the retained login ticket and CSRF token. The token name is registered for cleanup before creation, so cleanup is attempted even when a creation response is lost or malformed. Failures to delete are reported; expiry is the fallback when shutdown cannot complete. Pre-existing credentials are not revoked. Vault tokens created by the invocation are revoked after token cleanup.

Token deletion uses the Proxmox user token API.