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/services/device.py

@@ -197,6 +197,8 @@ async def get_devices(
     group_id: Optional[uuid.UUID] = None,
     sort_by: str = "created_at",
     sort_order: str = "desc",
+    site_id: Optional[uuid.UUID] = None,
+    sector_id: Optional[uuid.UUID] = None,
 ) -> tuple[list[DeviceResponse], int]:
     """
     Return a paginated list of devices with optional filtering and sorting.
@@ -235,6 +237,12 @@ async def get_devices(
             )
         )
 
+    if site_id:
+        base_q = base_q.where(Device.site_id == site_id)
+
+    if sector_id:
+        base_q = base_q.where(Device.sector_id == sector_id)
+
     # Count total before pagination
     count_q = select(func.count()).select_from(base_q.subquery())
     total_result = await db.execute(count_q)