- Introduced `parseStringList` helper to handle parsing of string arrays from config.
- Replaced `parseRelayList` and `parseRoster` with `parseStringList`.
- Replaced inline parsing of `relays` and `dashboard.relays` with `parseStringList`.
- Unified behavior: empty lists in config now consistently return `null` instead of `[]`.
- Added unit test verifying consistent `null` return for empty lists.
Co-authored-by: PR0M3TH3AN <[email protected]>