Split shared host config into dedicated modules

- Add shared modules for boot, hardware, networking, input, and host defaults
- Move host-specific TOML flags to new option namespaces
- Update SSH and service defaults for the new layout

hosts/dunamis/configuration.nix

@@ -35,6 +35,7 @@
   };
 
   networking.firewall = rec {
+    allowedTCPPorts = [8080];
     allowedTCPPortRanges = [
       {
         from = 1714;