feat(server): add automatic cleanup of upload files older than 24 hours

[abhishekmanegit]

What this PR does

Implements automatic cleanup of uploaded retina scan files to prevent disk exhaustion on the server, as requested in #37.

The server/uploads/ directory accumulates every uploaded scan with no removal mechanism. This PR adds a scheduled background task that automatically deletes files older than 24 hours.

Changes

• Added node-cron as a dependency (server/package.json)
• Created server/utils/cleanupUploads.js
  • Scans the server/uploads/ directory
  • Checks each file's last-modified timestamp (mtimeMs)
  • Deletes any file older than 24 hours
  • Logs each deletion and any errors encountered
• Updated server/index.js
  • Imports node-cron and the new cleanup utility
  • Schedules the cleanup job to run every hour (0 * * * *)
  • Also runs cleanup once immediately on server startup

How it works

const MAX_AGE_MS = 24 * 60 * 60 * 1000; // 24 hours

Every hour, the cron job iterates through all files in uploads/, compares each file's age against the 24-hour threshold, and removes any file that exceeds it using fs.unlink.

Testing

Tested locally by temporarily lowering the threshold to 10 seconds and the cron schedule to every 15 seconds:

1. Started the server (node index.js)
2. Manually created a test file inside server/uploads/
3. Confirmed via console logs that the scheduled job detected and deleted the file:
   🧹 Running scheduled uploads cleanup...

🗑️ Cleanup: deleted old file testfile.txt
4. Verified the file was removed from the uploads/ folder
5. Reverted the threshold and schedule back to production values (24 hours / hourly) before committing

Notes

• No changes were made to existing upload or analysis logic — this is purely additive.
• The MongoDB connection error visible in local logs is unrelated to this PR (no local MongoDB instance running during testing).

Closes #37

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