Decrement EventOwedTotal in claim_prize

[0xdevcollins]

Owed money stops being owed once claimed.

Done when

• claim_prize decrements EventOwedTotal alongside remaining_escrow
• Test: owed returns to zero after every named prize is claimed

Depends on the EventOwedTotal issue.

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Plan: boundless-bounty-programs-implementation-plan.md

[coderabbitai]

🔗 Related PRs

#83 - feat(events): replace push-based select_winners with pull-model claim_prize for unlimited winners [open]

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