Checks the file's mtime on each poll cycle (already running every
30s) rather than adding a separate file-watcher or admin UI. Proxmox
hosts already needed no config (auto-discovered every poll); this
covers the two lists that did. A parse failure logs and keeps the
previous config running instead of crashing the poller.
Closes#14.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
