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/nixos/shared/misc/default.nix

@@ -57,7 +57,7 @@
   '';
 
   zramSwap = {
-    enable = true;
+    enable = false;
     algorithm = "zstd";
     memoryPercent = 25;
     priority = 5;