This adds website portal account features so customers can access account-related documents such as invoices from the website. It also updates the sales portal integration, making online self-service more complete and reducing manual back-and-forth with staff.

Task: https://www.odoo.com/web#id=32988&view_type=form&model=project.task&action=333&active_id=965&menu_id=4720

This change reorganizes payment, sales, invoice portal, and online quote logic into clearer dedicated modules. It preserves existing customer-facing behavior while making payment and portal features easier to maintain and reuse across eCommerce and sales flows.

Clean and move payment stuff