moran 9ed638ad70 feat(transcription): add SiliconFlow as transcription provider
- Register SiliconFlow in transcription registry with default model
  FunAudioLLM/SenseVoiceSmall and alias 'silicon'
- Reuse existing OpenAITranscriptionProvider adapter (Whisper-compatible)
- Add generic key/base resolution: fallback to registry env_key and
  default_api_base when provider config is absent
- Add tests for registry entry, alias, adapter, default model, and
  config resolution with env var fallback
2026-06-10 23:05:12 +08:00
..
2026-06-10 18:09:36 +08:00
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