Contracts: Add explicit paused-state reason codes and query endpoint

[Junirezz]

Store paused-state reason codes and expose read method for operator visibility.

[Daniel202251]

@Daniel202251 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Good Day maintainer
I would like to solve this issue
ETA:1HR

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[miss-yusrah]

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

Hii, i'd like to work on this issue

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[drips-wave]

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

🧑‍💻 @miss-yusrah: 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 @miss-yusrah as part of the Stellar Wave Program's 5th Wave 🥳

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