fix(marker): set nio.markers on iou/dynamips/cloud nio update

The PUT /nio (update) endpoints for iou, dynamips and cloud copied nio.filters from the request body but never copied nio.markers. So adding a marker (e.g. a project-level global definition) to an already-created link of these node types left nio.markers empty: no mark filter was installed on uBridge and no marker.match signal was emitted. vpcs/qemu/docker already set it; mirror them (getattr for the Union NIO types).

gns3server/api/routes/compute/cloud_nodes.py

@@ -184,6 +184,8 @@ async def update_cloud_nio(
     nio.filters.clear()
     if nio_data.filters:
         nio.filters = nio_data.filters
+    # NIO type is a Union (Ethernet/TAP/UDP); only UDPNIO carries markers.
+    nio.markers = getattr(nio_data, "markers", None) or {}
     await node.update_nio(port_number, nio)
     return nio.asdict()