Archival and Restore Feature for SW360

SW360 instances running for years accumulate thousands of stale projects, components, and releases that slow down searches, waste disk space, and clutter the UI. Currently, the only cleanup option is permanent deletion with no undo. This project adds a reversible archival workflow. Admins select entities, export them as self-contained TAR.GZ bundles with all metadata and attachments, then remove them from the live database. A CouchDB registry tracks what was archived and by whom. To restore, admins upload the archive, preview contents with conflict detection, and selectively re-insert entities. Deliverables: archival.thrift service definition, backend Maven module with archive and restore logic, REST API endpoints, a frontend admin page with entity selection, registry table, and multi-step restore flow, plus unit and E2E tests."