Task A2 of the direct-order-wizard rewrite. Adds SO-header fields for
customer job #, three deadlines (planned start / internal / customer),
bill-to / ship-to address pickers, the line_ids O2M linking to
fp.direct.order.line, computed order totals, and a missing-info
warning banner. Partner onchange now also seeds default addresses.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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