feat(14-01): add site_id device filter, wireless data endpoints, and frontend API clients

- Add site_id and sector_id query parameters to devices list endpoint
- Add get_device_registrations and get_device_rf_stats to link_service
- Add RegistrationResponse, RFStatsResponse schemas to link.py
- Add /registrations and /rf-stats endpoints to links router
- Add sectorsApi frontend client (list, create, update, delete, assignDevice)
- Add wirelessApi frontend client (links, registrations, RF stats, unknown clients)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/routers/devices.py

@@ -87,6 +87,8 @@ async def list_devices(
     group_id: Optional[uuid.UUID] = Query(None),
     sort_by: str = Query("created_at", description="Field to sort by"),
     sort_order: str = Query("desc", description="asc or desc"),
+    site_id: Optional[uuid.UUID] = Query(None, description="Filter by site"),
+    sector_id: Optional[uuid.UUID] = Query(None, description="Filter by sector"),
     current_user: CurrentUser = Depends(get_current_user),
     db: AsyncSession = Depends(get_db),
 ) -> DeviceListResponse:
@@ -104,6 +106,8 @@ async def list_devices(
         group_id=group_id,
         sort_by=sort_by,
         sort_order=sort_order,
+        site_id=site_id,
+        sector_id=sector_id,
     )
     return DeviceListResponse(items=items, total=total, page=page, page_size=page_size)