Implement referral, points, coupons, commission, member levels, and order integration with migration SQL and background jobs.
Co-authored-by: Cursor <cursoragent@cursor.com>
Support multi cargo-type and warehouse combinations in price check billing. Auto-generate customer codes (W+yyMM+seq) on create/register; require email. Use order DownstreamSupplierCode as track UpsertSmallBag apiCode.
Co-authored-by: Cursor <cursoragent@cursor.com>