security(ai-valuation): Rate-limit guard for high-frequency valuation requests

[nanaf6203-bit]

Wire contracts/ai-valuation/src/rate_limit.rs so a single account cannot flood the model with requests per block. Add tests.

[DevMuhdishaq]

@DevMuhdishaq has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi Maintainer,

I’m a full-stack developer, and I’d like to contribute to the task. I’ll implement it carefully and efficiently thoroughly understand requirements and edge cases
Communicate promptly about suggestions or improvements. And I will provide regular progress updates and address blockers
Align with project goals through feedback and clarification.

Thank you,

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

[dahmeezy]

@dahmeezy has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I'd like to work on this issue.

I'll implement the rate-limit guard in contracts/ai-valuation/src/rate_limit.rs to prevent excessive valuation requests from a single account within the same block, and add tests to verify the expected behavior while ensuring existing tests continue to pass.

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

[Geff115]

@Geff115 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi, Please assign this issue to me, I want to work on this

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[MoscowDev]

@MoscowDev has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I’d love to take this issue on. I’ve worked on production-ready applications and collaborated extensively through GitHub workflows. I’ll dig into the current setup, implement a solid and reliable fix, and deliver a well-tested PR. My focus is on clean, maintainable code and fast, dependable delivery.

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

[drips-wave]

Congratulations, @DevMuhdishaq! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @DevMuhdishaq: 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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