feat: add global user administration for admin users

Backend:
- Add getAllUsuarios() to get users from all tenants
- Add updateUsuarioGlobal() to edit users and change their tenant
- Add deleteUsuarioGlobal() for global user deletion
- Add global admin check based on tenant RFC
- Add new API routes: /usuarios/global/*

Frontend:
- Add UserListItem.tenantId and tenantName fields
- Add /admin/usuarios page with full user management
- Support filtering by tenant and search
- Inline editing for name, role, and tenant assignment
- Group users by company for better organization
- Add "Admin Usuarios" menu item for admin navigation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/web/components/layouts/sidebar.tsx

@@ -15,6 +15,7 @@ import {
   Bell,
   Users,
   Building2,
+  UserCog,
 } from 'lucide-react';
 import { useAuthStore } from '@/stores/auth-store';
 import { logout } from '@/lib/api/auth';
@@ -33,6 +34,7 @@ const navigation = [
 
 const adminNavigation = [
   { name: 'Clientes', href: '/clientes', icon: Building2 },
+  { name: 'Admin Usuarios', href: '/admin/usuarios', icon: UserCog },
 ];
 
 export function Sidebar() {