III-6791 - Add default sorting

[brampauwelyn]

Added

• default sorting

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Ticket: https://jira.publiq.be/browse/III-6791

[Copilot]

Pull Request Overview

This PR adds default sorting to the offers API by sorting results by creation date in descending order. This ensures that newly created offers appear first in the results.

• Added sort[created]: desc parameter to the offers API request
• Updated corresponding test expectations to include the new sorting parameter

Reviewed Changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated no comments.

File	Description
src/core/udb-api.service.js	Added default sorting parameter to findOffers method
src/core/udb-api.service.spec.js	Updated test expectations to include the new sorting parameter

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