Documents the architecture for PVM's managed digital signage system:
Orange Pi 5 as leaf node (local backend, screen management API, video
pipeline), Radxa ROCK 4D as thin-client display nodes (kiosk Chromium,
CEC control, mDNS auto-discovery). API-first design for web and tablet
management clients. libsql on leaf, PostgreSQL on core.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
