Refactored AdapterNews and NewsFragment to prevent ANRs caused by synchronous Realm queries on the main thread.

- Introduced `NewsItemData` DTO to decouple the adapter from Realm.
- Moved data fetching and processing to a background coroutine in `NewsFragment`.
- `AdapterNews` now uses `ListAdapter` with the `NewsItemData` DTO, removing all direct database access.
- Image paths are now pre-fetched in a single batch query, eliminating per-item lookups in `onBindViewHolder`.

Author: google-labs-jules[bot]