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

modules/users/user/services.nix

@@ -8,6 +8,8 @@
   # services.pueue.enable = true; # process queue in rust
   services.ssh-agent.enable = true;
 
+  services.kdeconnect.enable = true;
+
   services.vicinae = {
     enable = true;
     systemd.enable = true;