- Added `sendWashCertificateToCustomer` method in `order_bookings_o` to handle email sending for wash certificates. - Implemented `sendWashCertificateEmailToCustomer` in `email` to generate and attach wash certificate PDFs. - Updated attachment permission logic in `ordersRoute` and `db_object_t`. - Changed `object_attachments_o` property types and handling for improved attachment processing.