RewardManager set_nft_reward_contract should emit an event

[Samuel1-ona]

Observability: set_nft_reward_contract silently updates the default NFT contract address. Add a NftContractSetEvent { old_contract: Option<Address>, new_contract: Address } for auditability.

[Gpraiz01]

@Gpraiz01 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

hi can i work on this

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[playmaker410]

@playmaker410 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi Maintainer,

I’d love to take this on. I have hands-on experience with Rust, Soroban, Cairo, and TypeScript, and I’m confident I can deliver a solid solution

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[MorsH14]

@MorsH14 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Id love to work on this

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[HuyadO4]

@HuyadO4 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi maintainr, I would love to work on this issue.

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[Babigdk]

@Babigdk has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Kindly assign me to work on this issue 🙏

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[drips-wave]

Congratulations, @Gpraiz01! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @Gpraiz01: 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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