feat(speechify): add Speechify TTS plugin#1968

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luke-speechify wants to merge 13 commits into

livekit:mainfrom

luke-speechify:lo/add-speechify-plugin

Commits on Jul 22, 2026

fix(speechify): rename token to apiKey, hide SDK client from public API
luke-speechify
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fix(speechify): forward abortSignal and emit final:true once per reply
luke-speechify
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fix(speechify): advance word-timestamp offset by full sentence duration
luke-speechify
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