Fixes: 1) Standardized error responses in `DownloadDigitalAssetView`.
Extra: Improved maintainability by refactoring serializers and schema definitions into modular components; updated API URLs to use new class-based view.
Fixes: 1) Correct line references in locale files for consistency;
Extra: Improve formatting and alignment of string segments for clarity and maintainability;
Fixes: 1) Simplify Prometheus and GraphQL path definitions in `evibes/api_urls.py`;
Extra: 1) Add line breaks across multiple files for improved code readability.