Task A4. Expands fp.direct.order.line with: part related fields,
optional new-revision block, additional treatment M2M, per-line
deadline + rush flag, description template + free-text, onchange
auto-price-lookup from customer price list, onchange template
suggestion (part > customer > coating), and _get_or_bump_revision
helper that will be called by the SO-creation loop.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
9423a93961