Add `GET /account/:id/trustlines` with issuer home domain resolution

[Sulex45]

Add an endpoint that returns all trustlines for an account, and for each asset
attempts to resolve the issuer's home_domain from their Stellar account and
fetches the stellar.toml to return the asset's official name and description.

Acceptance Criteria:

• GET /account/:id/trustlines returns all non-native balances
• For each asset, attempt to resolve issuer home_domain → fetch https://<home_domain>/.well-known/stellar.toml
• Parse TOML to extract name, desc, image for the asset if available
• Gracefully handles issuers with no home_domain or unreachable TOML
• Adds toml field to each asset: { name, description, image } | null
• Tests cover both resolved and unresolved cases

[Faith-okereke]

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

Hello, can I work on this issue?I have experience building Effective and Scalable API endpoints

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

[drips-wave]

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

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