Enhance article import process by adding support for optional logistic fields (`moq`, `origin`) and implementing progress tracking with `total_rows` and `rows_processed`. Update related schemas, repositories, and services to accommodate these changes. Improve documentation to reflect new features and usage. Add tests for new functionality and ensure existing tests cover the updated logic.

Add article import functionality with CSV and Excel support, including API endpoints for starting imports, listing imports, and handling import errors. Implement background processing for imports, validation, and error handling. Update requirements and documentation accordingly.