Add 1Password GUI and CLI via NixOS programs module

Enables programs._1password (CLI) and programs._1password-gui with
polkit authorization for user chexit. allowUnfree is already set,
so packages install without additional config.

https://claude.ai/code/session_01NS2hpapno51a1Ng7hWaQKy

configuration.nix

@@ -81,6 +81,12 @@
     extraGroups = [ "networkmanager" "wheel" "docker" ];
   };
 
+  programs._1password.enable = true;
+  programs._1password-gui = {
+    enable = true;
+    polkitPolicyOwners = [ "chexit" ];
+  };
+
   programs.throne = {
     enable = true;
     tunMode.enable = true;