// GET /api/health — monitor-ai 自身健康检查
export async function GET() {
  const d = new Date()
  const timestamp = `${d.getFullYear()}-${String(d.getMonth()+1).padStart(2,'0')}-${String(d.getDate()).padStart(2,'0')}T${String(d.getHours()).padStart(2,'0')}:${String(d.getMinutes()).padStart(2,'0')}:${String(d.getSeconds()).padStart(2,'0')}+08:00`
  return Response.json({ status: 'OK', timestamp })
}