Restructure frontend code to allow for extensions (#4721)

# Description of Changes
Move frontend code into `core` folder and add infrastructure for
`proprietary` folder to include premium, non-OSS features

frontend/src/core/components/tools/repair/RepairSettings.tsx

@@ -0,0 +1,23 @@
+import React from 'react';
+import { useTranslation } from 'react-i18next';
+import { RepairParameters } from '@app/hooks/tools/repair/useRepairParameters';
+
+interface RepairSettingsProps {
+  parameters: RepairParameters;
+  onParameterChange: <K extends keyof RepairParameters>(parameter: K, value: RepairParameters[K]) => void;
+  disabled?: boolean;
+}
+
+const RepairSettings: React.FC<RepairSettingsProps> = (_) => {
+  const { t } = useTranslation();
+
+  return (
+    <div className="repair-settings">
+      <p className="text-muted">
+        {t('repair.description', 'This tool will attempt to repair corrupted or damaged PDF files. No additional settings are required.')}
+      </p>
+    </div>
+  );
+};
+
+export default RepairSettings;