docs(plans): Express Orders implementation plan
22 bite-sized tasks across 6 phases (A: schema, B: backend logic, C: views + OWL widgets, D: drafts routing + Phase 2 banner, E: smoke test runbook, F: Phase 3/4 deferred cleanup). Each task follows TDD pattern (test → fail → implement → pass → commit) with exact file paths, complete code blocks, and runnable docker exec test commands. Built from the 2026-05-26 design spec. Locked decisions baked in: reuse fp.direct.order.wizard, NEW per-line flags (masking_enabled / bake_instructions / customer_line_ref), NEW per-part defaults, override-application helper at SO confirm, pricelist-per-currency picker, quick-create part modal, drawing upload to part, drafts-list dual-routing, soft-deprecation phase-out.
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