Add missing timelock config key and bounds constants

[hman38705]

Issue 033: Add missing timelock config key and bounds constants

Area: Contracts
Priority: High
Files: contracts/predict-iq/src/types.rs, contracts/predict-iq/src/modules/governance.rs

Problem

Governance references ConfigKey::TimelockDuration, TIMELOCK_MIN_SECONDS, and TIMELOCK_MAX_SECONDS but they are not defined. Contract fails to compile.

Acceptance Criteria

• Missing enum variants and constants are added\n- Timelock setter enforces bounds\n- Tests validate boundary behavior\n- Constants are documented

[Realericky]

@Realericky has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi. I would like to work on this

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Congratulations, @Realericky! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @Realericky: 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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[drips-wave]

This issue has been completed by @Realericky as part of the Stellar Wave Program's 4th Wave 🥳

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