Support recognizing from wav files in azure-transcribe, make speech g…

[pragmatrix]

…ate optional.

[Copilot]

Pull Request Overview

This PR adds support for recognizing speech from WAV files in azure-transcribe and makes the speech gate feature optional. The changes enable the azure-transcribe example to accept either microphone input or a WAV file path as a command-line argument.

Key changes:

• Made speech gate configurable via a boolean parameter in azure-transcribe
• Added WAV file recognition capability to the azure-transcribe example
• Changed audio channels from bounded to unbounded for better performance

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
services/playback/src/lib.rs	Made audio_file_to_frames function public for external access
services/azure/src/transcribe.rs	Added optional speech gate parameter and conditional processing
examples/azure-transcribe.rs	Extended example to support both microphone and WAV file input
core/src/protocol.rs	Added deprecation warning and architecture comment
core/src/lib.rs	Changed audio channels from bounded to unbounded
audio-knife/Cargo.toml	Version bump to 1.4.0
Cargo.toml	Version bump to 1.1.0 and added playback dependency