fix(flake): expose inputs for downstream propagation

flake.nix

@@ -23,6 +23,9 @@
   };
 
   outputs = { self, nixpkgs, nixos-hardware, disko, impermanence, home-manager, nix-colors, stylix, walker, ... } @ inputs: {
+    # Expose inputs for downstream use
+    inherit inputs;
+
     nixosModules = {
       system = import ./modules/system;
       home = import ./modules/home;