Contracts: Add admin key rotation flow with on-chain role handover event

[Junirezz]

Implement safe admin key handover and emit explicit role-transfer events.

[paulpeter32-coder]

@paulpeter32-coder has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

please i need issues

ℹ️ Repo Maintainers: To accept this application, review their application or assign @paulpeter32-coder to this issue.

[DokaIzk]

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

gm gm can I please be assigned this?

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[drips-wave]

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

🧑‍💻 @DokaIzk: 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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