feat(#116): update command hooks for synchronous group response

Add CommandGroupResponse and ConfigUpdateResponse types. Switch
useSendGroupCommand and useSendRouteCommand from openapi-fetch to authFetch
returning CommandGroupResponse. Update useUpdateApplicationConfig to return
ConfigUpdateResponse and fix all consumer onSuccess callbacks to access
saved.config.version instead of saved.version.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/Admin/AppConfigDetailPage.tsx

@@ -155,7 +155,7 @@ export default function AppConfigDetailPage() {
     updateConfig.mutate(updated, {
       onSuccess: (saved) => {
         setEditing(false);
-        toast({ title: 'Config saved', description: `${appId} updated to v${saved.version}`, variant: 'success' });
+        toast({ title: 'Config saved', description: `${appId} updated to v${saved.config.version}`, variant: 'success' });
       },
       onError: () => {
         toast({ title: 'Save failed', description: 'Could not update configuration', variant: 'error' });