fix(jupiter): add oneVPL/MFX runtime for QSV hardware transcoding

HEVC HDR transcodes were failing with "Error creating a MFX session: -9"
because intel-media-driver only provides VAAPI, not the separate
oneVPL/MFX runtime QSV needs to create a hardware session.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

machines/jupiter/hardware-configuration.nix

@@ -35,6 +35,7 @@
       #vaapiIntel         # LIBVA_DRIVER_NAME=i965 (older but works better for Firefox/Chromium)
       libva-vdpau-driver
       libvdpau-va-gl
+      vpl-gpu-rt # oneVPL/MFX runtime, required for QSV (h264_qsv/hevc_qsv) session creation
     ];
   };