fix(builtin): hide GNS3 internal bridge interfaces from Cloud node

Filter out host interfaces whose name starts with 'gns3' (e.g.
EthernetSwitch kernel bridges) from Cloud.asdict() interfaces list.
Other special interfaces (virbr0, docker0, etc.) remain visible.

gns3server/compute/builtin/nodes/cloud.py

@@ -82,6 +82,9 @@ class Cloud(BaseNode):
         host_interfaces = []
         network_interfaces = gns3server.utils.interfaces.interfaces()
         for interface in network_interfaces:
+            # Hide GNS3 internal bridges (e.g. EthernetSwitch kernel bridges)
+            if interface["name"].lower().startswith("gns3"):
+                continue
             host_interfaces.append(
                 {
                     "name": interface["name"],