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/default.nix

@@ -0,0 +1,17 @@
+# CLI tools aggregator — imports all base command-line utilities.
+{...}: {
+  imports = [
+    ./bat.nix
+    ./carapace.nix
+    ./direnv.nix
+    ./eza.nix
+    ./fzf.nix
+    ./lf.nix
+    ./nitch.nix
+    ./packages.nix
+    ./television.nix
+    ./zellij.nix
+    ./zellij-ps.nix
+    ./zoxide.nix
+  ];
+}