Added a new REST endpoint to return open DEX offers for a Stellar acc…

[Riel101]

Close #14

Summary

Adds a new REST endpoint to return open DEX offers for a Stellar account.

What changed

• Implemented GET /account/:id/offers in account.js
• Validates Stellar account IDs using existing validator logic
• Supports pagination with:
  • limit
  • cursor
• Returns each offer with:
  • id
  • selling asset object + amount
  • buying asset object
  • price
  • lastModifiedLedger

Tests

• Added coverage for GET /account/:id/offers in api.test.js
• Verified:
  • valid account returns open offers
  • limit is respected
  • invalid account ID returns 400 ValidationError

Files changed

• account.js
• api.test.js
• index.js (added new endpoint to root endpoint listing)

Notes

This PR implements issue #14: Add GET /account/:id/offers endpoint and includes validation, pagination, and required response fields.

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[Sulex45]

Resolve src/index.js