Export

POST /api/export
Content-Type: application/json
Authorization: Bearer plain_pk_xxx (或 cookie)

{
  "kind": "deck",
  "format": "pptx",
  "source": "---\nmarp: true\n...",
  "workspace": [],
  "filename": "Q3-pitch"
}

const res = await fetch('https://inplain.app/api/export', {
  method: 'POST',
  headers: {
    'content-type': 'application/json',
    'authorization': `Bearer ${PAT}`,
  },
  body: JSON.stringify({ kind: 'deck', format: 'pptx', source }),
});
const blob = await res.blob();
const url = URL.createObjectURL(blob);
window.location.href = url;