Add asVoice parameter to sendBlueBubblesAttachment that converts audio
to iMessage voice memo format (Opus CAF at 48kHz) and sets isAudioMessage
flag in the BlueBubbles API.
This follows the existing asVoice pattern used by Telegram.
- Convert audio to Opus CAF format using ffmpeg when asVoice=true
- Set isAudioMessage=true in BlueBubbles attachment API
- Pass asVoice through action handler and media-send
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