Introduce t_employee linked to RBAC users, switch employee numbers to IDE001+, and keep invite bind/newcomer coupon backend changes. Drop retired sql/migrate and seed scripts in favor of db.sql.
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>
