fix(deps): restore paru install gated on pacman presence

On Arch-based systems (pacman present), paru-build offers yay or
makepkg as install methods. On non-Arch systems neither pacman nor yay
exist, so no methods are built and the dep is silently skipped — no
prompt shown to the user.

functions/_fish_deps_catalog.fish

@@ -33,7 +33,7 @@ function _fish_deps_catalog
         eza lsd bat btop dust duf prettyping most ripgrep lazygit lazydocker trash kitty wezterm
 
     set -g _fdc_special \
-        "" fisher-bootstrap curl-installer fzf-update "" "" "" \
+        "" fisher-bootstrap curl-installer fzf-update "" "" paru-build \
         pipx "" \
         "" "" "" "" "" "" "" "" "" "" "" "" "" ""
 end