feat(ansible): Inventory on one page, add behind dialogs, delete behind the confirm (#5333)

/ansible/inventory/ shows every target (address, its linked Steward host,
its groups) and every group (members, the schedules aimed at it) under a
verdict line. The whole row opens the target or group. Add target and
Add group open small dialogs; a failed add comes back with its dialog
open and what was typed. The red x leaves the rows: Delete is on the
target's or group's page, behind the confirm dialog, saying which
schedules would be left with nothing to run on.

The two list pages (/inventory/targets, /inventory/groups) are gone
with no redirect (rule 122); their URLs keep only the Add POST.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

plugins/host_agent/templates/settings_list.html

@@ -74,7 +74,7 @@
   <h3 style="margin-bottom:0.4rem;">Agent lifecycle via Ansible</h3>
   <p style="font-size:0.82rem;color:var(--text-muted);margin-bottom:0.6rem;">
     These actions run bundled <strong>Ansible playbooks</strong> to deploy and maintain the
-    Steward monitoring agent on your <a href="/ansible/inventory/targets">inventory hosts</a>.
+    Steward monitoring agent on your <a href="/ansible/inventory/">inventory hosts</a>.
     Steward generates each host's API token automatically and connects over SSH as the managed
     <code>steward</code> account — you'll be dropped into the live Ansible run to watch it.
   </p>
@@ -95,7 +95,7 @@
   </div>
   {% elif not (deploy_targets or deploy_groups) %}
   <p style="font-size:0.85rem;color:var(--text-dim);margin:0;">
-    No Ansible inventory targets yet. Add some under <a href="/ansible/inventory/targets">Ansible → Inventory</a>.
+    No Ansible inventory targets yet. Add some under <a href="/ansible/inventory/">Ansible → Inventory</a>.
   </p>
   {% endif %}
 </div>