Sale order product recommendation with elaborations

This module extends the product recommendation wizard used on sale orders so that elaborations (extra preparation or finishing options) are not lost when you reorder products for a customer.

• When recommendations are generated, the wizard looks at the customer's past sale order lines and copies the elaborations and elaboration note from the most recent line for each product.
• If a recommended product already exists on the current sale order, the elaborations and note already on that line are used instead.
• In the recommendation wizard, each line now shows an "Elaborations" group with the selected elaborations and a free-text elaboration note, both in the form and in the list view.
• When you accept a recommendation, the elaborations and note are transferred to the new or updated sale order line, so the sales order keeps the same preparation details.

The module touches the recommendation wizard (sale.order.recommendation and sale.order.recommendation.line) and relies on the elaboration mixin from the elaboration module. It adds no new menus; the changes appear inside the existing product recommendation screen on sale orders.