refactor: complete rewrite

modules/nixos/console/shell/default.nix

@@ -0,0 +1,5 @@
+{
+  imports = [
+    ./fish.nix
+  ];
+}

modules/nixos/console/shell/fish.nix

@@ -0,0 +1,22 @@
+{
+  lib,
+  config,
+  ...
+}: let
+  inherit (lib) mkIf mkEnableOption;
+  adminShell = config.ooknet.host.admin.shell;
+  cfg = config.ooknet.shell.fish;
+in {
+  options.ooknet.shell.fish.enable = mkEnableOption "Enable fish module";
+
+  config = mkIf (adminShell == "fish" || cfg.enable) {
+    programs.fish = {
+      enable = true;
+      vendor = {
+        completions.enable = true;
+        config.enable = true;
+        functions.enable = true;
+      };
+    };
+  };
+}