TTS/STT: speech-to-text using gemini in unified API

[Prajna1999]

Summary

Target issue is #515
Add Gemini STT to unified API

Checklist

Before submitting a pull request, please ensure that you mark these task.

• Ran fastapi run --reload app/main.py or docker compose up in the repository root and test.
• If you've fixed a bug or added code that is tested and has test cases.

Notes

Draft PR

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