Import the purchase-price constant for Nest build, and only convert IRT-scale balances so migrate re-runs do not divide credits again. Co-authored-by: Cursor <cursoragent@cursor.com>
Balance is SMS credits (1 per 64 chars); top-ups add floor(IRT/500) credits, track sms_sent_count, and convert existing IRT balances. Co-authored-by: Cursor <cursoragent@cursor.com>