feat: migrate TTS providers to backend direct routing#36

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Kiritogu wants to merge 13 commits intodatawhalechina:devfrom

Kiritogu:fix/tts-voice-flow

Commits on Feb 25, 2026

chore: commit all current local changes (exclude airi)
Kiritogu
committed

Commits on Feb 26, 2026

refactor(tts): move synthesis to frontend direct provider calls
Kiritogu
committed

Commits on Feb 27, 2026

feat(asr): align aliyun nls transcription flow with airi
Kiritogu
committed
feat(asr): migrate aliyun to bailian realtime and simplify settings
Kiritogu
committed

Commits on Feb 28, 2026

Commits on Mar 1, 2026