fix(iou): carry suspend from the NIO update body

The IOU NIO update route never copied the body's suspend flag onto the
NIO; the Docker and QEMU routes always did. Harmless on the relay, where
suspend is emulated by the synthetic frequency_drop filter the controller
injects, but fatal on a kernel link, whose suspend *is* the anchor's
admin state: a suspended link kept forwarding traffic, and the resume
looked like it worked because nothing had ever stopped.

gns3server/api/routes/compute/iou_nodes.py

@@ -228,8 +228,11 @@ async def update_iou_node_nio(
     if isinstance(nio_data, schemas.UDPNIO) and nio_data.filters:
         nio.filters = nio_data.filters
     # NIO type is a Union (Ethernet/TAP/UDP/bridge); only UDPNIO and
-    # BridgeNIO carry markers.
+    # BridgeNIO carry markers and suspend. Suspend is what the compute turns
+    # into an admin-down anchor on a kernel link (native carrier), so it must
+    # reach the NIO like it does on the Docker/QEMU routes.
     nio.markers = getattr(nio_data, "markers", None) or {}
+    nio.suspend = getattr(nio_data, "suspend", None) or False
     await node.adapter_update_nio_binding(adapter_number, port_number, nio)
     return nio.asdict()