add upload pHash check

[tusharshah21]

Summary

This PR adds an automated copyright fingerprinting check to the video upload flow by generating a perceptual hash (pHash) for each uploaded video and comparing it against protected hashes. If a match is found, the upload is flagged for manual review instead of proceeding to transcoding.

Changes

• Added AutomatedCopyrightFingerprintingService to:
  • generate pHash for uploaded video files
  • check for matches against protected_video_hashes
  • record fingerprint outcomes in video_fingerprints
• Integrated fingerprinting into POST /api/videos/upload:
  • computes pHash for every upload
  • flags matched uploads as flagged_for_review and returns 202
  • skips transcoding for matched uploads
  • preserves existing upload/transcoding flow for non-matches
• Added focused tests in automatedCopyrightFingerprinting.test.js for:
  • protected-hash match => flagged + no transcoding
  • no match => normal upload + transcoding

Closes #50

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