feat(instances): a VM's network devices as cards, each with its QoS limits

Settings > Network was a table whose fields were read-only inputs cut
off at phone width, an unlabelled "+", three icon buttons per NIC and
a separate QoS table keyed by MAC. The owner chose card layout from
three rendered options, with the QoS limits folding out like the
device details:

- A card per NIC: a VM's only NIC spans the row, two or more sit side
  by side from md. Each has its name and target, the link state as a
  switch, its source and IPv4 addresses, and "Device details"
  (type, MAC, model, NWFilter, IPv6) in a <details>.
- "QoS limits" in a second <details>, its summary naming the limited
  directions: a form per inbound or outbound limit, with Save and
  Delete limit, and the units.
- Labelled Edit, Add QoS and Delete in the card footer; "Add network
  device" by the heading. The edit and add-QoS dialogs are titled and
  labelled, and the edit dialog's fields have labels.

The limits come from each NIC of the persistent definition, so the QoS
table, Instance.config_qos and wvmInstance.get_all_qos are removed.

networks/templates/add_network_qos.html

@@ -1,17 +1,12 @@
 {% load i18n %}
-{% load bootstrap_icons %}
 {% if request.user.is_superuser %}
-    <a href="#AddQos{{ id }}" type="button" class="btn btn-sm btn-success float-end" data-bs-toggle="modal" title="add qos">
-        <span aria-hidden="true">{% bs_icon 'qr-code' %} </span>
-    </a>
-
     <!-- Modal pool -->
     <div class="modal fade" id="AddQos{{ id }}" tabindex="-1" role="dialog" aria-labelledby="AddQosLabel{{ id }}"
          aria-hidden="true">
         <div class="modal-dialog">
             <div class="modal-content">
                 <div class="modal-header">
-                    <h5 class="modal-title">{% trans "Add QoS for Network" %}</h5>
+                    <h5 class="modal-title" id="AddQosLabel{{ id }}">{% trans "Add QoS for Network" %}</h5>
                     <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
                 </div>
                 <div class="modal-body">