fix: add "s" to http URL for debugging in production environment

- Added "s" to `http://bcfcode.ir` in the `baseURL` to test and debug the production environment (changing it to `https://bcfcode.ir`).
- Updated the `fetchCompletedChallenges` function to include the `cache: "no-store"` option in the fetch request, ensuring that the data is always freshly fetched from the server.
- This change is part of debugging efforts to resolve potential HTTPS-related issues with the API requests.

Note: The modification to `baseURL` is temporary for debugging purposes. Will revert once the issue is resolved.