fix(payments): credit gems before marking IAP receipt consumed & add retry #15459
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Previously we marked the IAP receipt consumed in the DB before attempting
to credit gems. If crediting failed (e.g. transient DB/network error),
the token was "burned" and the Android/iOS client would consume it on
their side, making retries impossible and causing players to pay without
receiving gems.
This change:
exponential-backoff wrapper around payments.buySkuItem.
'safeBuySkuItem', then 'IapPurchaseReceipt.create' only on success.
Now purchases are retried on transient failures and receipts are only
burned once delivery succeeds.