GetYoutubeLiveStreamInfo retrieves information about a YouTube live stream (status, title, etc).
YouTube channel handle or ID.
Specific video ID to check.
Successful response
GetYoutubeLiveStreamInfoResponse containing detection results.
Video ID of the live stream (if found).
Whether the stream is currently live.
Whether the channel exists.
Human-readable channel name.
HLS manifest URL (if available).
Stream title.
Optional error message.