Cleanup API links

[jakub-id]

No description provided.

[Copilot]

Pull request overview

This PR updates the broker API index (“/”) to remove non-actionable top-level links and replace the generic patron-requests link with two concrete, usable links for borrowing and lending requests.

Changes:

• Remove eventsLink and locatedSuppliersLink from the API index response.
• Replace patronRequestsLink with borrowingRequestsLink and lendingRequestsLink (including the required side query parameter).
• Update OpenAPI schema and index handler tests to match the new index response shape.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
broker/test/api/api-handler_test.go	Updates index response assertions to expect borrowing/lending patron request links instead of events/located suppliers.
broker/oapi/open-api.yaml	Updates the Index.links schema: removes old link fields and requires the new borrowing/lending link fields.
broker/api/api-handler.go	Adjusts the index handler to emit the new borrowing/lending links and drop the removed ones.