Remove unused configuration and commented code

Eliminated obsolete systemPath entry from Darwin services default configuration. Removed unused foreign-env plugin and commented code related to shell initialization in Fish configuration. Additionally, commented out unnecessary SSH configuration options in user-specific settings.

modules/nixos/services/base/default.nix

@@ -170,6 +170,12 @@ in
     };
 
     programs.git.enable = true;
+    programs.git.config = {
+      "filter \"rot8000\"" = {
+        smudge = "${pkgs.metacfg.rot8000}/bin/rot8000";
+        clean = "${pkgs.metacfg.rot8000}/bin/rot8000";
+      };
+    };
 
     virtualisation.libvirtd.enable = true;
 

systems/x86_64-linux/mx/default.nix

@@ -45,7 +45,13 @@
     options = "--delete-older-than 7d";
   };
 
-  programs.git.config.safe.directory = "/var/lib/gitea/repositories/harald/nixcfg.git";
+  programs.git.config = {
+    safe.directory = "/var/lib/gitea/repositories/harald/nixcfg.git";
+    "filter \"rot8000\"" = {
+      smudge = "${pkgs.metacfg.rot8000}/bin/rot8000";
+      clean = "${pkgs.metacfg.rot8000}/bin/rot8000";
+    };
+  };
 
   environment.systemPackages = with pkgs; [
     age