feat(hardware): add ssd module to hardware

system/modules/hardware/ssd/default.nix

@@ -0,0 +1,26 @@
+{ lib, config, ... }:
+
+let
+  cfg = config.systemModules.hardware.ssd;
+  inherit (lib) mkIf mkEnableOption;
+in
+
+{
+  options.systemModules.hardware.ssd = {
+    enable = mkEnableOption "Enable bluetooth module";
+  };
+  
+  config = mkIf cfg.enable {
+    services.fstrim = {
+      enable = true;
+    };
+    # only run fstrim while connected on AC
+    systemd.services.fstrim = {
+      unitConfig.ConditionACPower = true;
+      serviceConfig = {
+        Nice = 19;
+        IOSchedulingClass = "idle";
+      };
+    }; 
+  };
+}