- Add migration script for ivanti_finding_archives and ivanti_archive_transitions tables
- Add archive detection logic (detectArchiveChanges, detectClosedFindings) in sync pipeline
- Add archive API router with list, stats, and history endpoints at /api/ivanti/archive
- Add ArchiveSummaryBar UI component with four state cards (ACTIVE, ARCHIVED, RETURNED, CLOSED)
- Integrate ArchiveSummaryBar into Ivanti findings page in App.js
- Register archive router in server.js
