feat(iace): VDA-Format FMEA Excel Export

- GET /projects/:id/fmea/export → xlsx im VDA-Formblatt
- Spalten: Nr, Komponente, Typ, Fehlerart, Fehlerfolge, S, O, D, RPZ, AP, Massnahme
- AP-Zellen farbig: H=rot, M=gelb, L=gruen
- Dependency: github.com/xuri/excelize/v2 (BSD-3-Clause)
- Frontend: "VDA Excel exportieren" Button auf FMEA-Seite

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

admin-compliance/app/sdk/iace/[projectId]/fmea/page.tsx

@@ -46,6 +46,20 @@ export default function FMEAPage() {
         </p>
       </div>
 
+      {/* Export Button */}
+      <div className="flex justify-end">
+        <a
+          href={`/api/sdk/v1/iace/projects/${projectId}/fmea/export`}
+          className="flex items-center gap-2 px-4 py-2 bg-green-600 text-white rounded-lg hover:bg-green-700 text-sm font-medium transition-colors"
+          download
+        >
+          <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 10v6m0 0l-3-3m3 3l3-3m2 8H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z" />
+          </svg>
+          VDA Excel exportieren
+        </a>
+      </div>
+
       {/* Stats */}
       <div className="grid grid-cols-4 gap-3">
         <StatCard label="Gesamt" value={stats.total} color="gray" />