Refactor monolithic modules and harden booking, email, and auth infrastructure.

Split oversized frontend API client, email service, and admin/booking pages into focused modules while preserving import surfaces, and add Redis-backed queues, stale booking cleanup, stronger auth, and scale deployment configs.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/app/admin/events/[id]/_components/StatusBadge.tsx

@@ -0,0 +1,19 @@
+import clsx from 'clsx';
+
+export function StatusBadge({ status, compact = false }: { status: string; compact?: boolean }) {
+  const styles: Record<string, string> = {
+    pending: 'bg-yellow-100 text-yellow-800',
+    confirmed: 'bg-green-100 text-green-800',
+    cancelled: 'bg-red-100 text-red-800',
+    checked_in: 'bg-blue-100 text-blue-800',
+  };
+  return (
+    <span className={clsx(
+      'inline-flex items-center rounded-full font-medium',
+      compact ? 'px-1.5 py-0.5 text-[10px]' : 'px-2 py-0.5 text-xs',
+      styles[status] || 'bg-gray-100 text-gray-800'
+    )}>
+      {status.replace('_', ' ')}
+    </span>
+  );
+}