Add RustDesk service and nginx configuration

hosts/crossbox/rustdesk.nix

@@ -0,0 +1,24 @@
+{ config, pkgs, lib, ... }:
+
+{
+  services.rustdesk = {
+    enable = true;
+    server = {
+      port = 16484;
+      # Optional: Set a password for the server
+      # password = "your-password";
+    };
+    client = {
+      # Optional: Set a password for the client
+      # password = "your-password";
+    };
+  };
+  
+  # Open firewall port for RustDesk
+  networking.firewall.allowedTCPPorts = [ 16484 ];
+  
+  # Install RustDesk
+  environment.systemPackages = with pkgs; [
+    rustdesk
+  ];
+}