Add GET /stellar-toml/:domain endpoint

[Sulex45]

Description:
Add an endpoint that fetches and parses the stellar.toml file for any given domain and returns it as structured JSON.
Acceptance Criteria:

GET /stellar-toml/:domain fetches https:///.well-known/stellar.toml
Parses and returns structured JSON covering ACCOUNTS, CURRENCIES, VALIDATORS, and DOCUMENTATION sections
Returns 404 if TOML is not found
Returns 400 for invalid or missing domain
Tests added

[barnabasolutayo-lgtm]

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

"I would love to implement this endpoint to enhance the API's Stellar ecosystem integrations, leveraging my experience with Node.js/TypeScript backend development, TOML parsing, and error handling to reliably fetch, parse, and structure network domain data with full test coverage."

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

[Praizfotos]

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

Hello Please I'd love to work on this

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

[drips-wave]

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

🧑‍💻 @barnabasolutayo-lgtm: 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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