Initial commit of video_extractor toolkit

Widevine/DRM research and video download scripts (Apple, CDA, Sky, TVP),
CDM tooling, and helper utilities. Excludes downloads/.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WFUhtZEpkGZJjNCGFS9r4Z

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