[17.0][ADD] purchase_supplier_approved

[dreispt]

This module allows to define approved suppliers for each product and validates purchase orders against these approvals.

Features

• Define approved suppliers for each product with validity dates
• Configure approved supplier requirements per Product Category
• Set individual product exceptions to override category settings
• Security group "Manage Approved Suppliers" to control who can manage approvals
• Smart buttons on Product Template and Partner forms to view related approvals
• Warning when adding unapproved suppliers to purchase orders
• Validation that blocks purchase order confirmation if suppliers are not approved
• Override mechanism for authorized users with mandatory reason