example: add ai transcode

[tony-go]

Usage:

bare examples/live-audio-to-whisper.js
Usage:
  bare examples/live-audio-to-whisper.js --device <index> [duration] [whisper-url]

List audio devices:
  ffmpeg -f avfoundation -list_devices true -i ""

Example:
  bare examples/live-audio-to-whisper.js --device 0 15

Example:

bare examples/live-audio-to-whisper.js --device 3 15 http://localhost:9090
Opening avfoundation (:3)...
Source: 48000Hz, 1ch
Capturing 15s...
Segment 1/2: 10.00s, 320182 bytes
Sending to http://localhost:9090/inference ...
Segment 2/2: 5.00s, 160162 bytes
Sending to http://localhost:9090/inference ...

─── Transcription ───
Hi, man, how are you?
 How are you? [BLANK_AUDIO]