Voicenote Storage: Optimize audio handling

[Prajna1999]

Summary

Target issue is #804
Explain the motivation for making this change. What existing problem does the pull request solve?

Checklist

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• 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.

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[codecov]

Codecov Report

❌ Patch coverage is 51.30435% with 56 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
backend/app/services/llm/jobs.py	56.86%	22 Missing ⚠️
backend/app/utils.py	30.43%	16 Missing ⚠️
backend/app/crud/llm.py	31.25%	11 Missing ⚠️
backend/app/services/llm/chain/executor.py	53.33%	7 Missing ⚠️

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