feat: version 2.15.0 -- pestaña Compartir en Equipos (acceso de solo lectura)

Admin/superadmin dan acceso de solo lectura (Resumen, Equipos, Software) a otros usuarios;
el backend valida el acceso en cada endpoint y el menu aparece solo a quien lo tenga.
Migracion 026 (device_viewers).

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

frontend/src/services/devices.js

@@ -15,3 +15,8 @@ export const createInventoryToken = (label) => api.post('/devices/tokens', { lab
 export const setInventoryTokenActive = (id, isActive) => api.patch(`/devices/tokens/${id}`, { isActive });
 export const deleteInventoryToken = (id) => api.delete(`/devices/tokens/${id}`);
 export const getInventoryTokenSecret = (id) => api.get(`/devices/tokens/${id}/secret`);
+
+export const getDevicesAccess = () => api.get('/devices/access');
+export const listDeviceViewers = () => api.get('/devices/viewers');
+export const addDeviceViewer = (userId) => api.post('/devices/viewers', { userId });
+export const removeDeviceViewer = (userId) => api.delete(`/devices/viewers/${userId}`);