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/lib/api/usuarios.ts

@@ -19,3 +19,18 @@ export async function updateUsuario(id: string, data: UserUpdate): Promise<UserL
 export async function deleteUsuario(id: string): Promise<void> {
   await apiClient.delete(`/usuarios/${id}`);
 }
+
+// Funciones globales (admin global)
+export async function getAllUsuarios(): Promise<UserListItem[]> {
+  const response = await apiClient.get<UserListItem[]>('/usuarios/global/all');
+  return response.data;
+}
+
+export async function updateUsuarioGlobal(id: string, data: UserUpdate): Promise<UserListItem> {
+  const response = await apiClient.patch<UserListItem>(`/usuarios/global/${id}`, data);
+  return response.data;
+}
+
+export async function deleteUsuarioGlobal(id: string): Promise<void> {
+  await apiClient.delete(`/usuarios/global/${id}`);
+}