remove: drop Pendientes from nav menu

Pending-approval flow is no longer used. Remove the nav link so the
page is no longer reachable from the sidebar (routes and backend logic
left intact in case they're needed later).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

admin/Layout.php

@@ -47,7 +47,6 @@ class Layout
                 ['chat',       '/admin/chat',              'chat',       'Chat'],
             ],
             [
-                ['pending',    '/admin/pending',           'pending',    'Pendientes', $pending],
                 ['companies',  '/admin/companies',         'companies',  'Empresas'],
             ],
             [