feat(systemModules:host): add initial host configuration module

used to define general host configuration, including:

- hardware
- name
- admin
- type
- role

system/modules/host/hardware/features/default.nix

@@ -0,0 +1,20 @@
+{ lib, config, ... }:
+
+let
+  inherit (lib) types mkOption;
+in
+
+{
+  imports = [
+    ./bluetooth
+    ./backlight
+    ./battery
+    ./ssd
+  ];
+
+  options.systemModules.host.hardware.features = mkOption {
+    type = with types; listOf (enum ["bluetooth" "backlight" "battery" "ssd"]);
+    default = [];
+    description = "What extra hardware feature system modules to use";
+  };
+}