Added 60dB integration

[manishEMS47]

What we added
Live voice dubbing via 60db — GameCap now speaks each translated subtitle line aloud in real time. Deepgram still does transcription; 60db's WebSocket TTS adds the spoken output. It's off by default.

• services/tts_service.py — streams translated lines to 60db over WebSocket and plays the audio.
• launcher_app/voice_fetcher.py — fetches your voices (GET /myvoices) for the dropdown.
• New SIXTYDB_* settings in config.py / settings.json and a "60db Voice (TTS)" section in the launcher.
• transcription_service.py + main.py wired to call TTS after translation; websockets added to requirements.

How to use it

1. pip install -r requirements.txt
2. python launcher.py → Settings
3. Paste your 60db API Key, click Save, reopen Settings so voices load.
4. Pick a Voice, turn SIXTYDB_TTS_ENABLED on, Save.
5. Launch a game — lines are now subtitled and spoken.