Offload videos list processed-cache scan from event loop

[groupthinking]

Move the /api/v2/videos/list processed-video cache directory scan and per-file JSON reads into a worker thread to keep the event loop responsive.

[linear-code]

GRV-275

[github-actions]

👋 Thanks for opening this issue! It has been automatically labeled for triage.

[coderabbitai]

⚠️ Possible Duplicate Issue(s)

• perf: /api/v2/videos/list scans and parses the processed-video cache on the event loop #1287

🔗 Related PRs

#1228 - perf: offload video result cache disk I/O to worker threads [merged]

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