Add key remap for macos

hosts/darwin/system-default.nix

@@ -3,6 +3,7 @@
 {
   imports = [
     ../../modules/homebrew.nix
+    ../../modules/keyboard.nix
     nix-homebrew.darwinModules.nix-homebrew
   ];
 

modules/keyboard.nix

@@ -0,0 +1,22 @@
+{ config, pkgs, ... }:
+
+{
+  # Key remapping using hidutil via launchd agent
+  # This swaps Control and Caps Lock keys bidirectionally
+  
+  launchd.user.agents.remap-keys = {
+    serviceConfig = {
+      ProgramArguments = [
+        "/usr/bin/hidutil"
+        "property"
+        "--set"
+        ''{"UserKeyMapping":[{"HIDKeyboardModifierMappingSrc":0x700000039,"HIDKeyboardModifierMappingDst":0x7000000E0},{"HIDKeyboardModifierMappingSrc":0x7000000E0,"HIDKeyboardModifierMappingDst":0x700000039}]}''
+      ];
+      RunAtLoad = true;
+      KeepAlive = false;
+      Label = "org.nixos.remap-keys";
+      StandardErrorPath = "/tmp/remap-keys.err";
+      StandardOutPath = "/tmp/remap-keys.out";
+    };
+  };
+}