feat: add support for HF backup configuration and update routing to handle app-based sync status reporting

feat: add optional WhatsApp integration with toggle and status monitoring

refactor: delay workspace sync and guardian startup until after gateway initialization

feat: implement persistent WhatsApp session backup and restore via workspace sync and add automatic session invalidation on auth errors

feat: implement DNS-over-HTTPS fallback for network requests and add a web dashboard to the health server.

Initial commit