Command STT providers received the raw audio file with no format
normalization: _transcribe_command_stt only checked .exists() before
substituting {input_path}. Desktop voice recordings arrive as WebM/Opus
48 kHz and providers with container/sample-rate contracts (e.g. Tencent
16k_zh) reject the raw webm, so desktop voice chat failed on every
message. _transcode_audio_for_stt (ffmpeg -> 16 kHz mono m4a) existed
but was wired only into the OpenAI path's rejection retry.
Add stt.providers.<name>.normalize (default off, so whisper-style CLIs
that accept any container keep the original file): when truthy, the
input is transcoded into the per-call temp dir and {input_path} points
at the normalized file. Transcode failure returns an error envelope
instead of silently feeding the raw container to a provider the user
declared needs normalization.
Fixes#81811
Co-authored-by: embwl0x <embwl0x@users.noreply.github.com>
4f91c5a462