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

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

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📥 Commits

Reviewing files that changed from the base of the PR and between e8d87ff and 07f4fc6.

📒 Files selected for processing (6)

• backend/app/core/storage_utils.py
• backend/app/crud/llm.py
• backend/app/models/llm/request.py
• backend/app/services/llm/chain/executor.py
• backend/app/services/llm/jobs.py
• backend/app/utils.py

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/b64-to-s3

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[codecov]

Codecov Report

❌ Patch coverage is 46.61017% with 63 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
backend/app/utils.py	11.53%	23 Missing ⚠️
backend/app/services/llm/jobs.py	56.86%	22 Missing ⚠️
backend/app/crud/llm.py	31.25%	11 Missing ⚠️
backend/app/services/llm/chain/executor.py	53.33%	7 Missing ⚠️

📢 Thoughts on this report? Let us know!

[Ayush8923]

Please fix the codecov before merging the PR.