Loyalty multi product criteria in sale

This module connects multi-product promotion rules to the sales order flow. When Odoo checks whether a sales order qualifies for a promotion, it now also verifies that the order contains all the products required by the rule.

• If a promotion rule uses the "multi product" criterion, the order must include every product listed in that rule (with a positive quantity) before the promotion can be applied.
• If the required products are missing, the customer sees the message "You don't have the required product quantities on your sales order." and the promotion is not granted.
• Reward lines are ignored when checking the products, so only real purchased products count.

The module adds read access to the multi-product criteria configuration for salespeople, and full access for sales managers, so they can view or manage these rules from the Sales area. It works together with the Loyalty and Sales apps and affects the sale.order model and the loyalty criteria model. No new menus or screens are added; the behaviour is integrated into the existing promotion checks on sales orders.