fix: Refactor flake structure to properly use flake-parts

- Remove incorrect parts/fleet-data.nix import from flake.nix
- Create flake-parts wrappers for fleet-option.nix and users.nix
- Import inventory.nix through fleet-option wrapper
- Fix module argument passing (remove pkgs from mkFleet call)
- Move NixOS-specific modules out of flake-parts imports

This addresses the 'path does not exist' error but introduces infinite recursion that needs to be resolved.

flake.nix

@@ -76,6 +76,7 @@
       imports = [
         ./parts/formatter.nix
         ./parts/lib.nix
+        ./parts/fleet-option.nix
         ./parts/nixos-configurations.nix
         ./parts/nixos-modules.nix
         ./parts/packages.nix

parts/fleet-option.nix

@@ -0,0 +1,9 @@
+# Flake-parts wrapper for fleet-option.nix
+{ inputs, self, lib, config, ... }:
+let
+  fleetModule = import ../fleet/fleet-option.nix { inherit inputs lib; };
+  inventoryModule = import ../inventory.nix { };
+in
+{
+  imports = [ fleetModule inventoryModule ];
+}

parts/nixos-configurations.nix

@@ -1,12 +1,9 @@
 # NixOS configurations generated from fleet
-{ inputs, self, lib, pkgs, config, ... }:
+{ inputs, self, lib, config, ... }:
 {
-  imports = [
-    (import ../fleet/fleet-option.nix { inherit inputs lib pkgs config; })
-  ];
   flake.nixosConfigurations =
     let
-      fleet = self.lib.mkFleet { inherit inputs lib pkgs config; };
+      fleet = self.lib.mkFleet { inherit inputs lib config; };
     in
     fleet.nixosConfigurations;
 }

parts/users.nix

@@ -0,0 +1,7 @@
+# Flake-parts wrapper for users.nix
+{ inputs, ... }:
+let
+  # Minimal pkgs just for shell paths - will be overridden in actual NixOS configs
+  pkgs = inputs.nixpkgs.legacyPackages.x86_64-linux;
+in
+import ../users.nix { inherit pkgs; }