Add MEV protection for liquidations and large transactions

[Smartdevs17]

Description

Liquidations and large transactions are vulnerable to MEV extraction. Implement protection mechanisms.

Acceptance Criteria

• Batch auction for liquidation opportunities
• Commit-reveal scheme for large transactions
• Slippage protection with deadline parameters
• Private mempool integration (Flashbots-style)
• MEV extraction monitoring dashboard
• Gas price bidding analysis

Technical Scope

• stellar-lend/contracts/hello-world/src/mev_protection.rs
• stellar-lend/contracts/lending/src/
• Edge: commit-reveal UX friction, private mempool censorship, gas auction efficiency

[Hovibby]

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

I would like to handle this issue

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

[drips-wave]

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

🧑‍💻 @Hovibby: 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.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊