ENHANCEMENT: Migrate File Uploads to Cloud Storage (S3/Azure Blob)

[Aayuiiitmg]

Description
Answer scripts and answer keys are stored locally in the /uploads directory, creating scalability and reliability issues.

Current Issue
fileUpload.js stores files locally. This limits deployability (can't use serverless), creates backup issues, and files are lost if the container restarts. Current implementation on Render (a single dyno) has no persistent storage strategy.

Proposed Improvement

Integrate AWS S3 (or Azure Blob Storage) for cloud file storage
Implement secure pre-signed URLs for file access
Add automatic cleanup of uploaded files after processing
Implement virus scanning for uploaded PDFs
Add CDN integration for fast file delivery

Expected Outcomes

Platform can scale across multiple servers/regions
Files are safely persisted with redundancy
Better security with controlled file access
Improved performance with CDN delivery

Please assign me this issue under GSSOC 26

[Aayuiiitmg]

Anu updates @AA1-34-Ganesh

[AA1-34-Ganesh]

@Aayuiiitmg, Thanks for suggestion, but I am closing this issue because it does not satisfy with our current architecture, we already use Supabase Storage, by adding AWS S3 or Azure Blob is out of scope.

For now, focus on completing PR #54, then I will assign another issue.