feat: DSR User Data Export — Art. 15 PDF + Art. 20 JSON/CSV

- DSRExportService: aggregates all CMP data about a user from
  Banner Consents, Einwilligungen, Audit Trail, DSR History
- GET /dsr/{id}/export-user-data?format=json|csv|pdf endpoint
- PDF: A4 reportlab with 4 sections (Consents, Einwilligungen,
  Audit-Trail, DSR-Anfragen) + cover page
- CSV: BOM-encoded for Excel with flattened data rows
- JSON: structured export with all data categories
- ActionButtons.tsx: PDF/JSON/CSV export buttons now functional

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

admin-compliance/app/sdk/dsr/[requestId]/_components/ActionButtons.tsx

@@ -23,9 +23,24 @@ export function ActionButtons({
   if (isTerminal) {
     return (
       <div className="space-y-2">
-        <button className="w-full px-4 py-2 text-gray-600 bg-gray-100 hover:bg-gray-200 rounded-lg transition-colors text-sm">
+        <button
+          onClick={() => window.open(`/api/sdk/v1/dsr/${request.id}/export-user-data?format=pdf`, '_blank')}
+          className="w-full px-4 py-2 text-gray-600 bg-gray-100 hover:bg-gray-200 rounded-lg transition-colors text-sm"
+        >
           PDF exportieren
         </button>
+        <button
+          onClick={() => window.open(`/api/sdk/v1/dsr/${request.id}/export-user-data?format=json`, '_blank')}
+          className="w-full px-4 py-2 text-purple-600 bg-purple-50 hover:bg-purple-100 rounded-lg transition-colors text-sm"
+        >
+          JSON exportieren (Art. 20)
+        </button>
+        <button
+          onClick={() => window.open(`/api/sdk/v1/dsr/${request.id}/export-user-data?format=csv`, '_blank')}
+          className="w-full px-4 py-2 text-blue-600 bg-blue-50 hover:bg-blue-100 rounded-lg transition-colors text-sm"
+        >
+          CSV exportieren
+        </button>
       </div>
     )
   }