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/direnv.nix

@@ -0,0 +1,19 @@
+# Direnv — automatic environment loading with nix-direnv integration.
+{
+  config,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.base.cliTools.direnv;
+in {
+  options.base.cliTools.direnv.enable = mkEnableOption "enable direnv with nix-direnv";
+
+  config = mkIf cfg.enable {
+    programs.direnv = {
+      enable = true;
+      enableNushellIntegration = true;
+      nix-direnv.enable = true;
+    };
+  };
+}