Add remote browser pages and website sync

Enable managed remote browser custom pages with login autofill and add website sync workflows so external admin surfaces can be handled inside SmartUp.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/app/services/scheduler.py

@@ -14,6 +14,7 @@ from app.models.snapshot import UpstreamRateSnapshot
 from app.services.upstream_client import UpstreamClient, UpstreamError, build_snapshot
 from app.services.snapshot_service import diff_snapshots
 from app.services import webhook_service
+from app.services import website_sync
 from app.config import get_settings
 
 logger = logging.getLogger(__name__)
@@ -105,6 +106,7 @@ def _check_upstream(upstream_id: int) -> None:
             webhook_service.send_rate_changed(
                 db, upstream.id, upstream.name, upstream.base_url, changes
             )
+            website_sync.sync_affected_bindings(db, upstream.id, changes)
             logger.info("upstream %s: %d rate change(s)", upstream.name, len(changes))
         else:
             logger.debug("upstream %s: no changes", upstream.name)