feat(jellyfin): grant iGPU access for Quick Sync hardware transcoding

modules/environments/jellyfin/default.nix

@@ -22,6 +22,8 @@ in
       openFirewall = true;
     };
 
+    environment.systemPackages = [ pkgs.libva-utils ];
+
     my.homepage.services = [
       {
         group = "Media";
@@ -34,6 +36,10 @@ in
 
     systemd.services.jellyfin = {
       after = [ "network-online.target" ];
+      serviceConfig.SupplementaryGroups = [
+        "video"
+        "render"
+      ];
     };
   };
 }