파일 업로드

curl https://www.aisplice.store/v1/media/upload-policy \
  -H "Authorization: Bearer sk-YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "kind": "file",
    "content_type": "application/pdf",
    "size": 1048576
  }'

const form = new FormData();
for (const [key, value] of Object.entries(policy.fields)) {
  form.append(key, String(value));
}
form.append("file", file); // keep the file field last

const uploaded = await fetch(policy.upload_url, {
  method: "POST",
  body: form,
});
if (!uploaded.ok) throw new Error(await uploaded.text());

const modelInputUrl = policy.public_url;