feat: implement finding archive tracking system

- 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

backend/server.js

@@ -23,6 +23,7 @@ const createArcherTicketsRouter = require('./routes/archerTickets');
 const createIvantiWorkflowsRouter = require('./routes/ivantiWorkflows');
 const createIvantiFindingsRouter = require('./routes/ivantiFindings');
 const createIvantiTodoQueueRouter = require('./routes/ivantiTodoQueue');
+const createIvantiArchiveRouter   = require('./routes/ivantiArchive');
 const createComplianceRouter      = require('./routes/compliance');
 
 const app = express();
@@ -219,6 +220,9 @@ app.use('/api/ivanti/findings', createIvantiFindingsRouter(db, requireAuth));
 // Ivanti queue routes — per-user staging queue for FP / Archer workflows
 app.use('/api/ivanti/todo-queue', createIvantiTodoQueueRouter(db, requireAuth));
 
+// Ivanti archive routes — finding archive tracking for severity score drift
+app.use('/api/ivanti/archive', createIvantiArchiveRouter(db, requireAuth));
+
 // AEO compliance routes — xlsx upload, non-compliant item tracking, notes
 app.use('/api/compliance', createComplianceRouter(db, upload, requireAuth, requireRole));