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/routers/upstreams.py

@@ -19,6 +19,7 @@ from app.services.upstream_client import UpstreamClient, UpstreamError, build_sn
 from app.services.snapshot_service import diff_snapshots
 from app.services import scheduler as sched_svc
 from app.services import webhook_service
+from app.services import website_sync
 from app.utils.auth import get_current_user
 
 router = APIRouter(prefix="/api/upstreams", tags=["upstreams"])
@@ -209,6 +210,7 @@ def check_now(uid: int, db: Session = Depends(get_db), _=Depends(get_current_use
         webhook_service.send_status_event(db, u.id, u.name, u.base_url, "upstream_recovered")
     if changes:
         webhook_service.send_rate_changed(db, u.id, u.name, u.base_url, changes)
+        website_sync.sync_affected_bindings(db, u.id, changes)
 
     msg = f"检测成功，{len(groups)} 个分组"
     if changes: