perf(audit-log): wire DataTable virtual prop on audit-log-list

Audit log entries accumulate via cursor pagination — the user can
load many pages into the same client-side array. With virtual=true
the table only renders the visible viewport rows (plus overscan), so
a 10k-row session stays at 60fps instead of choking on a full DOM
write per "Load more" click.

The other two BACKLOG candidates (super-admin port switcher, client
export modal preview) aren't present in the current codebase — the
super-admin route group hasn't been built and the export modal is
download-only. Skip until those surfaces exist.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/admin/audit/audit-log-list.tsx

@@ -518,6 +518,9 @@ export function AuditLogList() {
             isLoading={loading}
             getRowId={(row) => row.id}
             cardRender={(row) => <AuditLogCard entry={row.original} />}
+            virtual
+            virtualHeightPx={640}
+            virtualRowHeightPx={56}
             emptyState={
               <div className="text-center py-8">
                 <p className="text-muted-foreground">No audit log entries found.</p>