fix(nixos): avoid blocking guest startup on SteamCMD

configs/nixos/modules/services/steamcmd.nix

@@ -138,12 +138,14 @@
               WorkingDirectory = "-${service.steamDir}";
               ExecStartPre = "+${prepareScript}";
               ExecStart = updateScript;
+              TimeoutStartSec = "15min";
             };
           };
 
           ${service.serviceName} = {
             description = "${service.serviceName} game server";
             after = [
+              "multi-user.target"
               "network-online.target"
               "steamcmd-${service.serviceName}-update.service"
             ];
@@ -160,6 +162,7 @@
               ];
               ExecStart = startScript;
               Restart = "on-failure";
+              TimeoutStartSec = "15min";
             };
           };
         };