Implement Global Config Contract for Cross-Contract Settings

[Baskarayelu]

Description:

Add a small config contract to hold shared settings (limits, flags) used by other contracts.

Requirements

• config contract with admin-controlled typed key/value storage.
• Functions: set_config, get_config, get_all_keys.
• At least one existing hard-coded limit moved to config.

Acceptance Criteria

• Config contract implemented with tests
• At least one contract reading a value from config
• Admin-only writes enforced and documented

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[Anuoluwapo25]

@Anuoluwapo25 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hi maintainer, I'd like to take on this issue as i'll fully implement what is requested as i'm a fullstack web3 developer with experiences.

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Congratulations, @Anuoluwapo25! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

🧑‍💻 @Anuoluwapo25: 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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