audio-server: add rtkit to k-ot, install yt-dlp with youtube-dl alias

modules/audio-server.nix

@@ -161,10 +161,16 @@
 
     users = {
       groups.pulse-access = { };
-      users.k-ot.extraGroups = [
-        "pipewire"
-        "pulse-access" # required for system wide pulseaudio
-      ];
+      users.k-ot = lib.mkIf config.c3d2.k-ot.enable {
+        extraGroups = [
+          "pipewire"
+          "pulse-access" # required for system wide pulseaudio
+          "rtkit"
+        ];
+        packages = with pkgs; [
+          (yt-dlp.override { withAlias = true; })
+        ];
+      };
     };
   };
 }