[Backend] Set up Node/Express API server with TypeScript

[libby-coder]

Bootstrap the API with Express + TypeScript, eslint, prettier, and a src/ structure (routes/, services/, middleware/).

[coderolisa]

@coderolisa has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello maintainer let me work on this
please assign

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

[ezechinonyelumvivian-create]

@ezechinonyelumvivian-create has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I'm a professional and I'm good at what I do,assign me this issue please

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

[drips-wave]

Congratulations, @HybridDan! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @HybridDan: 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.

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