feat: add CSV export to audit log

ui/src/pages/Admin/AuditLogPage.tsx

@@ -1,8 +1,9 @@
 import { useState, useMemo, useCallback } from 'react';
 import {
-  Badge, DateRangePicker, Input, Select, MonoText, CodeBlock, DataTable,
+  Badge, Button, DateRangePicker, Input, Select, MonoText, CodeBlock, DataTable,
 } from '@cameleer/design-system';
 import type { Column } from '@cameleer/design-system';
+import { Download } from 'lucide-react';
 import { useAuditLog, type AuditEvent } from '../../api/queries/admin/audit';
 import styles from './AuditLogPage.module.css';
 import tableStyles from '../../styles/table-section.module.css';
@@ -17,6 +18,21 @@ const CATEGORIES = [
   { value: 'AGENT', label: 'AGENT' },
 ];
 
+function exportCsv(events: AuditEvent[]) {
+  const headers = ['Timestamp', 'User', 'Category', 'Action', 'Target', 'Result', 'Details'];
+  const rows = events.map(e => [
+    e.timestamp, e.username, e.category, e.action, e.target, e.result, e.details ?? '',
+  ]);
+  const csv = [headers, ...rows].map(r => r.map(c => `"${String(c).replace(/"/g, '""')}"`).join(',')).join('\n');
+  const blob = new Blob([csv], { type: 'text/csv' });
+  const url = URL.createObjectURL(blob);
+  const a = document.createElement('a');
+  a.href = url;
+  a.download = `cameleer-audit-${new Date().toISOString().slice(0, 16).replace(':', '-')}.csv`;
+  a.click();
+  URL.revokeObjectURL(url);
+}
+
 function formatTimestamp(iso: string): string {
   return new Date(iso).toLocaleString('en-GB', {
     year: 'numeric', month: '2-digit', day: '2-digit',
@@ -126,6 +142,9 @@ export default function AuditLogPage() {
               {totalCount} events
             </span>
             <Badge label="AUTO" color="success" />
+            <Button variant="ghost" size="sm" onClick={() => exportCsv(data?.items ?? [])}>
+              <Download size={14} /> Export CSV
+            </Button>
           </div>
         </div>
         <DataTable