Added 60dB integration

[manishEMS47]

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[ConalMullan]

Thanks for this, @manishEMS47 — really solid integration, and the Hindi/Indian-voice angle fills a genuine gap for us. I tested it against a live 60db key and found the only real issue: the code follows 60db's documented /tts-synthesize contract (single JSON audio_base64), but the live endpoint actually streams NDJSON of raw 48 kHz PCM — so the default path errored with "Invalid JSON response."

I've built on your commit (preserved with your authorship) and fixed the response handling to work against the live API, with end-to-end verification (EN + Hindi → valid MP3, voiceover.py --provider 60db per-scene). That's in #27, which credits this PR and closes it on merge. Thanks again! 🙌

[ConalMullan]

Closing in favour of #27, which builds directly on this work (your original commit is preserved with your authorship) and adds the live-API fix needed to make 60db work end-to-end — the production /tts-synthesize endpoint streams NDJSON of raw 48 kHz PCM rather than the documented single-JSON audio_base64 mp3, so the original path errored. Thanks again for kicking this off, @manishEMS47 — the Hindi/Indic voice support fills a real gap. Follow along on #27. 🙌