erio 66fde7a2e6 feat(redeem): support negative values for refund/deduction ...

Allow redeem codes with negative values to enable refund scenarios:
- Balance: negative value deducts balance (clamped to 0, never negative)
- Concurrency: negative value reduces concurrency (clamped to 0)
- Subscription: negative validity_days reduces remaining days; if
  remaining days <= 0, the subscription is canceled (set to expired)

All deductions generate standard redeem code records for audit trail.

2026-04-03 01:50:26 +08:00

4.4 KiB

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