Router.register('/environment', async () => {
  const data = await API.environment().catch(() => ({ temp: '—', hum: '—' }));
  return `<div class="grid cols-2">
    <div class="card"><div style="font-weight:600">温度</div><div class="badge">${data.temp}</div></div>
    <div class="card"><div style="font-weight:600">湿度</div><div class="badge">${data.hum}</div></div>
  </div>`;
});