Add functionality to download role permission audit history as a CSV file

Introduce a new admin-only API endpoint for exporting role permission audit data to CSV, including resolved permission names and UTF-8 BOM for Excel compatibility. Frontend button and backend logic implemented to support this feature.

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artifacts/tx-os/src/locales/ar.json

@@ -516,6 +516,8 @@
       "historyTotal_other": "{{count}} صلاحية بعد التغيير",
       "historyShowing": "يظهر {{shown}} من أصل {{total}}",
       "historyLoadMore": "عرض المزيد",
+      "historyDownloadCsv": "تنزيل CSV",
+      "historyDownloadCsvError": "تعذّر تنزيل ملف CSV. حاول مرة أخرى.",
       "historyFilters": {
         "actor": "غُيّرت بواسطة",
         "allActors": "أي شخص",