hailin 4c7c05eb37 feat(stt): support auto language detection for mixed Chinese-English input ... - Flutter: language='auto' omits the language field → backend receives none - Backend: no language field → passes undefined to STT service - STT service: language=undefined → omits language param from Whisper request - Whisper auto-detects language per utterance when no hint is provided Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>		2026-03-06 08:13:26 -08:00
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openai-stt.service.ts	feat(stt): support auto language detection for mixed Chinese-English input	2026-03-06 08:13:26 -08:00