refactor: storage.rs is never wired into the crate — dead code

[shakurJJ]

contracts/chainsetttle/src/storage.rs (585 lines) implements a storage layer, but there is no mod storage; declaration anywhere in lib.rs — the file is not part of the compiled crate at all. All storage access currently happens inline in lib.rs via env.storage() calls.

Acceptance criteria:

• Decide whether storage.rs should be wired in (as the storage abstraction layer) or deleted as dead code
• Implement the decision
• cargo build and cargo test still pass

[kureyoungabare-hub]

@kureyoungabare-hub has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I would like to work on this issue because it aligns with my experience and interest in open-source development. I have experience with JavaScript, TypeScript, React, Node.js, Git, and REST APIs, and I enjoy building clean, maintainable, and well-tested solutions. Thank you for considering my application.

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[neyij]

@neyij has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

hi, i would like to work on this.

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[OpensrcLord]

@OpensrcLord has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello @maintainer, I understand the expected outcome and would love to work on this. I'll provide a solution that satisfies the acceptance criteria.

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[k-deejah]

@k-deejah has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi Maintainer, I can work on this issue

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This issue has been completed by @k-deejah as part of the Stellar Wave Program's 7th Wave 🥳

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