curl --request POST \
  --url https://zeus-api.agentspro.cn/api/knowledge-base/kb_abc123/documents \
  --header 'Authorization: Bearer <token>' \
  --form 'file=@/path/to/document.pdf'

{
  "document_id": "doc_xyz789",
  "status": "pending",
  "file_name": "document.pdf"
}