fix: resolve ForensicEngine stdout corruption and add missing exif metadata field

[DebasmitaBose0]

Closes #344

Summary

Fixed a 500 error in the analysis route caused by corrupted stdout streams and missing metadata fields in the ForensicEngine.

Changes Made

• Removed print() statements from ForensicEngine.run_automated_process.
• Added "exif": {} to the returned dictionary in ForensicEngine.get_metadata.

Testing

• Verified through direct execution of python worker_runner.py and checked that it output pure JSON.
• Ran pytest suite verifying the test check successfully parses the result.

Impact

Restores functionality to the main file analysis and ingestion engine.

Checklist

• Code follows project standards
• Tested locally
• No unrelated changes included
• Responsive design verified
• Accessibility considered

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