zhonghui5207 0671201c05 feat(tts): add Gemini TTS provider ...

Add Google's Gemini speech-generation API as 8th TTS backend.
Returns base64-encoded signed 16-bit PCM at 24 kHz mono, wrapped
in WAV natively via stdlib wave module. Optional ffmpeg conversion
to mp3/ogg for Telegram voice bubbles.

Supports GEMINI_API_KEY and GOOGLE_API_KEY (fallback), 30 prebuilt
voices, configurable model (flash/pro).

Cherry-picked from #10922 by @zhonghui5207. Fixes #10918.

2026-04-16 20:47:29 +05:30

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