feat: auto-select STT engine (Azure → Google Cloud → Whisper) and show provider in results

Removes user-facing engine/model/key/beam controls. The server now picks
the best available engine automatically:
1. Microsoft Azure Speech — short clips (≤1MB, no diarization, audio/*)
2. Google Cloud Speech v2 — long audio, diarization, all languages
3. OpenAI Whisper GPU — local fallback

Results display which provider was used (e.g. "Transcribed with Google
Cloud Speech") via transcript-engine-badge and traceMeta.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
2026-05-16 13:22:24 +02:00
parent c6a9cc9199
commit 08d1e3cee3
14 changed files with 2937 additions and 416 deletions
Binary file not shown.