feat: raw MPEG-TS proxy, VA-API hardware decode, native video player

[wowitsjack]

Summary

• Raw MPEG-TS streaming proxy: Replace double-HLS architecture (ffmpeg → HLS segments → warp file server → HLS.js) with direct MPEG-TS streaming (ffmpeg stdout → tokio broadcast channel → warp HTTP endpoint → native <video>). Eliminates manifest caching issues and reduces latency.

• VA-API hardware video decode on Linux: Set WEBKIT_GST_ENABLE_LEGACY_VAAPI=1 and boost vaapih264dec/vah264dec decoder ranks to MAX so GStreamer actually selects hardware decoders. Add HardwareAccelerationPolicy::Always for WebKitGTK. CPU usage drops from ~80% to ~10% on Intel GPUs.

• NVIDIA-only DMABUF disable: WEBKIT_DISABLE_DMABUF_RENDERER=1 was being set for all GPUs. Now only set for NVIDIA (where it's actually needed), allowing other GPUs to use hardware rendering.

• Native video player: Drop HLS.js dependency entirely, use native <video> element with video.src pointed at the MPEG-TS stream. Simpler pipeline, fewer failure modes.

• Redirect resolution: HEAD request follows 302 chains to detect HLS streams behind redirects (e.g. tvpass.org → .m3u8), enabling direct playback without the proxy.

• Mute fix: Use video.muted property instead of video.volume = 0, persist mute state across stream changes.

Test plan

• Play a channel that requires the proxy (non-HLS, custom headers)
• Play a direct HLS channel (.m3u8 URL)
• Play a redirect chain channel (e.g. tvpass.org URLs that 302 to .m3u8)
• Verify mute button works and persists when switching channels
• Check CPU usage during playback on Linux (should be ~10-15% with VA-API)
• Verify NVIDIA GPUs still get DMABUF disabled
• Verify non-NVIDIA GPUs get VA-API decoders enabled

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[wowitsjack]

Superseded by #396 + #397 which contribute the full FredTV-Next codebase as a proper 2-part stack.