0xbyt4 8ec0656f53 feat(tts): add speed support for Edge TTS and OpenAI TTS ...

Read tts.speed (global) or tts.<provider>.speed (provider-specific) from
config. Provider-specific takes precedence over global.

- Edge TTS: converts speed float to SSML prosody rate string
- OpenAI TTS: passes speed param clamped to 0.25-4.0
- MiniMax: wired into global tts.speed fallback for consistency

Co-authored-by: 0xbyt4 <0xbyt4@users.noreply.github.com>

2026-04-12 16:46:18 -07:00

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