Safari/iOS browsers lack Widevine EME support, so DRM videos couldn't play.
This adds a server-side decrypt-and-stream pipeline that reuses the existing
downloadDrmMedia() code to decrypt videos on demand, cache them, and serve
plain MP4s with Range support for native <video> playback.
- server/drm-stream.js: new router with decrypt, status, and serve endpoints
- client/src/components/ServerDrmVideo.jsx: decrypt→poll→play lifecycle component
- DrmVideo.jsx: Widevine detection, falls back to ServerDrmVideo for Safari
- MediaGrid.jsx: passes raw mpdUrl through to DrmVideo
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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