Harden MediaConvert video webhook

[nexicturbo]

Summary

• validate public MediaConvert webhook events before mutating candidate video state
• require event resources to match the job id and UserMetadata.User to match the candidate found for that job
• normalize MediaConvert status handling so only COMPLETE stores output files, ERROR clears failed videos, and incomplete events do not mark videos processed
• add a focused regression check for the hardening guards

/claim #55

Validation

• python3 tests/check-mediaconvert-webhook-hardening.py
• git diff --check

Note: PHP/Codeception could not be run in this local environment because php is not installed.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1c95474f-53cb-4ed7-b47c-2ae4838c2506

📥 Commits

Reviewing files that changed from the base of the PR and between 7b023ff and 4143345.

📒 Files selected for processing (2)

• candidate/modules/v1/controllers/AccountController.php
• tests/check-mediaconvert-webhook-hardening.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[nexicturbo]

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