SC-20: Validate maximum active escrows per player to prevent storage bloat attacks

[chinweobtagaz]

Context: A malicious user can spam create_tournament_escrow to bloat contract storage and increase fees for everyone.
Location: contracts/game_contract/src/lib.rs
Acceptance Criteria:

• Enforce a maximum cap (e.g., 100) on active escrows per unique user address.

[Davichi-1]

@Davichi-1 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Dear maintainer please assign, I will deliver a great job

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Davichi-1 to this issue.

[drips-wave]

Congratulations, @Davichi-1! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @Davichi-1: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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