Empty-but-compiling Service that reads the audiobooks.enabled feature flag from server_settings. Wired into cmd/silo so the package is referenced from the binary; no routes mounted, no scheduled tasks registered, no DB writes. Subsequent sub-plans hang scanner branches, ABS handlers, Socket.io, podcast refresher, and SPA pages off this Service. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>