Add referrer-list aggregation, customer-code filters, and idempotent marketing seed data with customer 9 as referrer and 8 as referee.
Co-authored-by: Cursor <cursoragent@cursor.com>
Implement referral, points, coupons, commission, member levels, and order integration with migration SQL and background jobs.
Co-authored-by: Cursor <cursoragent@cursor.com>