feat: update flake.lock and add eilmeldung program with configuration

nixos/tako/configuration.nix

@@ -159,6 +159,7 @@
 
   # Open ports in the firewall.
   networking.firewall.allowedTCPPorts = [22 80 443];
+  networking.firewall.allowedUDPPorts = [8766 27016 9700];
 
   # Copy the NixOS configuration file and link it from the resulting system
   # (/run/current-system/configuration.nix). This is useful in case you

nixos/tako/services/games/default.nix

@@ -1,7 +1,12 @@
-{...}: {
+{pkgs, ...}: {
   imports = [
     # ./minecraft.nix
     # ./satisfactory.nix
     ./terraria.nix
   ];
+
+  environment.systemPackages = with pkgs; [
+    steamcmd
+    steam-tui
+  ];
 }