Refactor user management functions to use inputs

Removed the `lib.nix` file and refactored various modules to utilize `inputs.self.lib` for user package and attribute management. This change enhances consistency and maintainability across the configuration files.

modules/dev/rust.nix

@@ -1,5 +1,6 @@
 {
   config,
+  inputs,
   lib,
   pkgs,
   ...
@@ -32,9 +33,7 @@ in
   };
   config = lib.mkMerge [
     (lib.mkIf config.my.dev.rust.enable {
-      users.users = let
-        userLib = import ../lib.nix { inherit lib; };
-      in userLib.mkUserAttrs config.my.toggleUsers.dev { inherit packages; };
+      users.users = inputs.self.lib.mkUserAttrs lib config.my.toggleUsers.dev { inherit packages; };
     })
     {
       environment.variables.CARGO_HOME = "\${XDG_DATA_HOME}/cargo";