Mitchell's batch CB-95BA6C90: Stripe correctly charged $450.88 ($437.75 net +
$13.13 surcharge), but the DB + Telegram showed $503.40 with a $65.65 surcharge.
Two bugs:
1) On Stripe session creation, the per-row surcharge UPDATE wrote the FULL batch
surcharge ($13.13) to EVERY row via WHERE batch_id, so anything summing the
per-row field (the Telegram order notification) over-counted Nx (5 x $13.13 =
$65.65). Now the single surcharge is split across the rows so they sum to the
true total. Stripe was always charged correctly (one surcharge line item).
2) ensureComplianceSalesOrder built the ERPNext SO from full line-item prices but
applied NO discount, so the SO grand total over-stated what the customer paid.
Now applies the promo/bundle discount via apply_discount_on=Grand Total +
discount_amount on both the primary and fallback SO create.
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