No access to privileged networking (virbr0 and others)

`Traceback (most recent call last):
File "/app/share/virt-manager/virtManager/asyncjob.py", line 71, in cb_wrapper
callback(asyncjob, *args, **kwargs)
File "/app/share/virt-manager/virtManager/createnet.py", line 428, in _async_net_create
netobj.create()
File "/app/lib/python3.12/site-packages/libvirt.py", line 3569, in create
raise libvirtError('virNetworkCreate() failed')
libvirt.libvirtError: error creating bridge interface virbr0: Operation not permitted`

Start with the traceback entry points in /app/share/virt-manager/virtManager/asyncjob.py, virtManager/createnet.py, and /app/lib/python3.12/site-packages/libvirt.py, then reproduce creation of the virbr0 bridge. Determine why the packaged application receives “Operation not permitted” for privileged networking and document or fix the behavior so network creation succeeds or reports a clear actionable limitation.

Written by the indexing model from the issue text.