feat: módulo de empresa con números WhatsApp y endpoints API por empresa

- DB: company_phones (3 tipos de permiso, límites por usuarios ERP)
- DB: company_endpoints (11 endpoints upload/download configurables)
- DB: erp_active_users en companies (base para calcular límites)
- Company edit: 3 pestañas — General / Números WhatsApp / Endpoints API
- Límites: tipo 1 = usuarios_erp×10, tipo 2+3 = usuarios_erp
- Endpoints: URL configurable + botón Probar + preview de respuesta JSON
- Layout::close() agregado

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

public/index.php

@@ -265,6 +265,14 @@ $routes = [
     ['GET',  '/admin/test-message',      fn() => DashboardController::testMessage()],
     ['POST', '/admin/test-message/send', fn() => DashboardController::testMessageSend()],
 
+    // ─── Números WhatsApp por empresa ──────────────────────────────────────
+    ['POST', '/admin/company/phone/save',   fn() => DashboardController::companyPhoneSave()],
+    ['POST', '/admin/company/phone/delete', fn() => DashboardController::companyPhoneDelete()],
+
+    // ─── Endpoints API por empresa ─────────────────────────────────────────
+    ['POST', '/admin/company/endpoint/save', fn() => DashboardController::companyEndpointSave()],
+    ['POST', '/admin/company/endpoint/test', fn() => DashboardController::companyEndpointTest()],
+
     // ─── Admin: listar pendientes de aprobación ─────────────────────────────
     ['GET', '/admin/pending-list', fn() => DashboardController::pendingList()],
     ['GET', '/admin/pending', fn() => DashboardController::pending()],