创建 Channel QR Session

curl -s -X POST 'https://api.qoder.com/api/v1/forward/channels/channel_019eabc123/qr_sessions' \
  -H "Authorization: Bearer $QODER_PAT" \
  -H "Content-Type: application/json" \
  -d '{}'

{
  "session_key": "qr-a1b2c3d4",
  "channel_id": "channel_dingtalk-001",
  "channel_type": "dingtalk",
  "status": "waiting",
  "qr_code_content": "https://login.dingtalk.com/oauth2/...",
  "qr_code_image_base64": "data:image/png;base64,...",
  "expires_at": "2026-06-18T10:05:00Z",
  "poll_interval_seconds": 2
}