[Tooling] Add .rustfmt.toml and Enforce Formatting

[p3ris0n]

Reward: 200 Points (Stellar Wave 5)

Description
Standardize Rust formatting rules for the workspace.

Acceptance Criteria
Add config file and format the entire codebase.

[dev-RAM11]

@dev-RAM11 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi, I'd love to be assigned this issue. I've been actively contributing across Stellar Wave 4 and Wave 5 projects, working across smart contracts on Stellar/Soroban, Rust backends, NestJS APIs, Next.js frontends, and DevOps infrastructure — and I'm well-positioned to tackle this effectively.
I've reviewed the issue and have a clear implementation plan. I'll follow the project's contribution guidelines, write tests alongside the implementation, and keep the PR focused and reviewable.
Looking forward to contributing!

ℹ️ Repo Maintainers: To accept this application, review their application or assign @dev-RAM11 to this issue.

[drips-wave]

Congratulations, @dev-RAM11! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @dev-RAM11: 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.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊