Introduces UnifiOsIntegration, orchestrating UnifiOsApi (local) and
UnifiSmApi (optional cloud) to build the UnifiOsSummary. Local endpoint
calls degrade independently via Promise.allSettled; the cloud client is
never instantiated without a configured siteManagerApiKey secret.
Registers the unifiOs kind in the integration creator, index, and types
barrels, resolving the previously-failing typecheck.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>