[Backend] Add lightweight request tracing for upload and transcript routes

[SAI-HARISH2007]

Addressed Issues:

Improves backend observability and request tracing for critical routes.

Screenshots/Recordings:

Not applicable (backend logging improvement)

Additional Notes:

Summary

This PR adds lightweight request tracing to help debug and monitor important backend requests.

Changes

• Generates short request IDs for incoming requests
• Logs request start and completion for:
  • /upload
  • /getTranscript
• Includes HTTP status codes in completion logs
• Uses Flask request context (g) and Python uuid
• No business logic changed

Impact

This helps with:

• Easier debugging of failed requests
• Correlating logs for a single request lifecycle
• Better observability in production environments

AI Usage Disclosure:

This PR contains AI-assisted code. I identified the improvement opportunity through manual review and used AI minimally to refine implementation details. I tested the changes locally and take full responsibility.

Checklist

• My PR addresses a single improvement
• My code follows project conventions
• No new warnings or errors introduced
• I have read contribution guidelines
• I will address review comments

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 300768a5-b5cc-45db-8b2e-0324722ab456

📥 Commits

Reviewing files that changed from the base of the PR and between 2038116 and 76299ed.

📒 Files selected for processing (1)

• backend/server.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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