Feature/us 16 event details
This merge request introduces the functionality to display detailed information about an event on the Cosmos platform, as required by User Story 16. The backend now provides all necessary details about a specific event, including the title, institution, date, time, location, modality, and description. Additionally, this merge fixes an import issue related to Param, which was causing an error when trying to capture route parameters in the event controller. Key changes include the creation of a new GET endpoint that fetches full event details by ID. The response includes the event title, organizing institution, date and time, location (if the event is in-person), modality (online or offline), and a full description. It also pulls related event categories and associated projects, if any. To test, start the server and access the new endpoint at GET /event/:id, replacing :id with a valid event ID. Verify that all the expected details are returned. Also, test with invalid IDs to ensure proper error handling.