Method : POST
URL    : {{workerUrl}}/upload
Header : X-Upload-Secret: {{secret}}
         X-Video-Title: {{$json.title}}
Body   : Binary (video file)

Response:
  .url → simpan ke Sheets
  .cdn → URL untuk FB post

Method : GET
URL    : {{workerUrl}}/list
Header : X-Upload-Secret: {{secret}}

Response:
  .total  → jumlah video
  .videos → array of:
    .url  → stream URL
    .cdn  → CDN direct
    .key  → R2 key