Stock Inventory Cost Info

This module extends the Inventory Adjustments feature so users can see the monetary value of each adjustment line.

• On the inventory adjustment lines list, a new "Adjustment cost" column appears after the unit of measure. It is automatically calculated as the difference between the counted quantity and the theoretical quantity, multiplied by the product's cost. The column can be summed to show a total.
• The same information is added to the printed Inventory report: a new "Adjustment cost" column is inserted in the table that lists the inventory lines.
• The value is stored and recalculated automatically whenever the quantity difference changes or the inventory status changes.
• The currency used for the amount comes from the company of the inventory, so the column is displayed in the correct company currency.

The module only touches inventory adjustment lines (stock.inventory.line) and the inventory report. It does not add new menus or screens; it enriches existing ones.