Contracts: Add storage key namespace registry and collision prevention checks

[Junirezz]

Document and enforce storage namespace conventions to prevent key collisions.

[BYTES-TECHES]

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

Good Morning, Maintainer. How are you doing? I'm interested in this issue, and I can solve it.

Thank you in advance!

Please Again!

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

[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

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

[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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