Implement batched processing in voice optimizer

[google-labs-jules]

Implemented batched audio processing in VoiceOptimizer.

Changes:

1. Modified utils/unified_ai_service.py:
   • Added batch_speech_to_text method.
   • Imported ThreadPoolExecutor for concurrent processing.
2. Modified utils/voice_optimizer.py:
   • Imported get_unified_ai_service.
   • Updated process_batch to collect audio data and call batch_speech_to_text.
   • Updated callback invocation to include transcription results in metadata.

Verified with a custom test script tests/test_voice_optimizer_batch.py (deleted after verification) which mocked the service and asserted correct batch calling behavior.

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PR created automatically by Jules for task 11043252113513256885 started by @ntoledo319

[google-labs-jules]

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[qodo-code-review]

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