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This MR introduces the GET /events/by_access_code/{access_code} endpoint to retrieve an event by its access code registered in the system. The implementation includes the creation of the get_event_by_access_code method in the corresponding service, the route, and the controller logic to return the list of events. What was done [✅] Implemented the get_event_by_access_code() method in the EventController. [✅] Added the logic to fetch an event by access code in the EventService. [✅] Created unit tests to cover the new method.