API: Original (pre-discount) line item price missing from quote/webhook payload

Description:

We use the public API and the quote webhook to pull quote data into our financial system (AFAS). Currently the payload only includes the final price and the discount for each line item, not the original price before discount.

Since AFAS needs the original price, the discount amount in euros, and the final price, we currently have to reverse calculate the original price manually on our side, which is error prone.

Requested change:

Add the original (pre discount) unit price as a field on each quote line item in the API response and the quote webhook payload.

Reasoning:

The original price used on a specific quote line can differ from the current product catalogue price at any later point in time (manual overrides, distributor price fluctuations, per quote pricing). This means the original price needs to be sourced directly from the quote line itself, a catalogue lookup cannot reliably reconstruct it.

Impact:

Without this field, financial integrations like AFAS cannot reconcile original price, discount, and final price without manual recalculation, which increases risk of errors in customer invoicing/accounting data.