fix(controller): refresh cloud/nat node interfaces from compute on GET

Cloud and NAT nodes need live host network interface data. Previously,
GET /projects/{project_id}/nodes/{node_id} returned cached properties
from creation time, so newly added host interfaces (e.g. kernel bridges
created by EthernetSwitch nodes) were invisible until the node was
deleted and recreated.

Now the controller fetches fresh data from the compute node before
returning the response, so host interface changes are reflected
immediately. Falls back to cached data if compute is unreachable.

gns3server/controller/node.py

@@ -639,6 +639,14 @@ class Node:
             except asyncio.TimeoutError:
                 raise ControllerTimeoutError(f"Timeout when reset console {self._name}")
 
+    async def get(self, path="", **kwargs):
+        """
+        HTTP get on the node
+        """
+        return await self._compute.get(
+            f"/projects/{self._project.id}/{self._node_type}/nodes/{self._id}{path}", **kwargs
+        )
+
     async def post(self, path, data=None, **kwargs):
         """
         HTTP post on the node