fix: Remove incorrect ./parts/fleet-data.nix import from flake.nix and use correct flake-parts structure

fleet/default.nix

@@ -1,7 +1,7 @@
 {
   inputs,
-  fleet ? null,
-  hwTypes ? null,
+  lib,
+  config,
   ...
 }:
 
@@ -13,26 +13,12 @@
 # configurations with flexible type associations.
 
 let
-  nixpkgs = inputs.nixpkgs;
-  lib = nixpkgs.lib;
 
   # Evaluate inventory to get fleet data
   # Import fleet-option.nix (defines athenix.fleet) and inventory.nix (sets values)
   # We use a minimal module here to avoid circular dependencies from common.nix's imports
-  inventoryModule = lib.evalModules {
-    modules = [
-      (import ./fleet-option.nix { inherit inputs; })
-      {
-        _module.args = {
-          pkgs = nixpkgs.legacyPackages.x86_64-linux;
-        };
-      }
-      (lib.mkIf (fleet != null) { athenix.fleet = lib.mkForce fleet; })
-      (lib.mkIf (hwTypes != null) { athenix.hwTypes = lib.mkForce hwTypes; })
-    ];
-  };
-
-  hostTypes = inventoryModule.config.athenix.hwTypes;
+  
+  hostTypes = config.athenix.hwTypes;
 
   # Helper to create a single NixOS system configuration
   mkHost =
@@ -64,9 +50,7 @@ let
           null;
 
       # Load users.nix to find external user modules
-      pkgs = nixpkgs.legacyPackages.${system};
-      usersData = import ../users.nix { inherit pkgs; };
-      accounts = usersData.athenix.users or { };
+      accounts = config.athenix.users or { };
 
       # Build a map of user names to their nixos module paths (if they exist)
       # We'll use this to conditionally import modules based on user.enable
@@ -285,7 +269,7 @@ let
     lib.recursiveUpdate deviceHosts countHosts
   );
 
-  fleetData = inventoryModule.config.athenix.fleet;
+  fleetData = config.athenix.fleet;
 
   # Flatten the nested structure
   allHosts = lib.foldl' lib.recursiveUpdate { } (lib.attrValues (processInventory fleetData));