feat(home): extract CLI tools into modular home/base structure

- Add individual modules for: bat, carapace, direnv, eza, fzf, lf, nitch,
  television, zellij, zellij-ps, zoxide
- Centralize in home/base/cli-tools/ with default.nix aggregator
- Simplify home/base/packages by removing extracted tools

home/base/cli-tools/carapace.nix

@@ -0,0 +1,20 @@
+# Carapace — multi-shell completion engine with Fish, Nushell, and Bash integration.
+{
+  config,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.base.cliTools.carapace;
+in {
+  options.base.cliTools.carapace.enable = mkEnableOption "enable carapace completion engine";
+
+  config = mkIf cfg.enable {
+    programs.carapace = {
+      enable = true;
+      enableFishIntegration = true;
+      enableNushellIntegration = true;
+      enableBashIntegration = true;
+    };
+  };
+}