feat(backend): add GET /api/streams/:id/claim-history dedicated endpo… - #898

Commit Type

• feat: A new feature
• fix: A bug fix
• docs: Documentation only changes
• style: Changes that do not affect the meaning of the code (formatting, etc.)
• refactor: A code change that neither fixes a bug nor adds a feature
• perf: A code change that improves performance
• test: Adding missing or correcting existing tests
• build: Changes affecting the build system or external dependencies
• ci: Changes to CI/CD configuration files and scripts
• chore: Other changes that don't modify src or test files
• revert: Reverts a previous commit

Breaking change?

• Yes — this contains a breaking change
• No

What changed

• Added GET /api/streams/:id/claim-history to return a paginated history of claims for a stream.
• Limited results to claim events with claim ID, amount, timestamp, transaction hash, and recipient details.
• Added handling for unknown stream IDs and Stellar Explorer transaction links.

Testing done

• Verified only claim events are returned.
• Tested pagination and unknown stream 404 responses.
• Confirmed transaction hashes generate valid Stellar Explorer links.

Related issues

Closes #730

Checklist

• I used the correct commit type (see above) for the squashed commit message.
• I kept the change focused on the related issue.
• I added or updated tests where useful.
• I updated documentation where behavior changed.
• I verified the app still builds or explained why verification was skipped.
• My commits follow [Conventional Commits](https://www.conventionalcommits.org/) (enforced by commitlint).