[ADD] sale_pricelist_price: add "Book Price" field on SO and Invoice lines.

[pusu-odoo]

Currently users cannot currently see the original pricelist price when editing sales order lines or invoice lines, making it difficult to compare with manually adjusted prices.

This change introduces a new module sale_pricelist_price that adds a computed field book_price on sale.order.line and account.move.line. The field calculates the original pricelist price based on the selected pricelist, product, and quantity.

Views updated:

• Sales Order Lines tree view to display book_price.
• Invoice Lines tree view (customer invoices) to display book_price.
• Sale order lines are now color-coded: green if unit_price > book_price, red if unit_price < book_price.

This ensures visibility of baseline pricelist prices for better decision-making and easier verification of manual adjustments.

task-5072748

[robodoo]