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/nitch.nix

@@ -0,0 +1,16 @@
+# Nitch — minimal system information display tool.
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  cfg = config.base.cliTools.nitch;
+in {
+  options.base.cliTools.nitch.enable = mkEnableOption "enable nitch";
+
+  config = mkIf cfg.enable {
+    home.packages = [pkgs.nitch];
+  };
+}