Update nix flake

flake.nix

@@ -1,31 +1,17 @@
 {
   description = "Photo/video organization tool";
 
-  # Nixpkgs / NixOS version to use.
   inputs.nixpkgs.url = "nixpkgs/nixos-24.11";
 
   outputs = { self, nixpkgs }:
     let
-
-      # to work with older version of flakes
       lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101";
-
-      # Generate a user-friendly version number.
       version = "2.0.0";
-
-      # System types to support.
       supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
-
-      # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
       forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
-
-      # Nixpkgs instantiated for supported system types.
       nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
-
     in
     {
-
-      # Provide some binary packages for selected system types.
       packages = forAllSystems (system:
         let
           pkgs = nixpkgsFor.${system};
@@ -34,25 +20,21 @@
           photocatalog = pkgs.buildGoModule {
             pname = "photocatalog";
             inherit version;
-            # In 'nix develop', we don't need a copy of the source tree
-            # in the Nix store.
             src = ./.;
-
-            # This hash locks the dependencies of this package. It is
-            # necessary because of how Go requires network access to resolve
-            # VCS.  See https://www.tweag.io/blog/2021-03-04-gomod2nix/ for
-            # details. Normally one can build with a fake hash and rely on native Go
-            # mechanisms to tell you what the hash should be or determine what
-            # it should be "out-of-band" with other tooling (eg. gomod2nix).
-            # To begin with it is recommended to set this, but one must
-            # remember to bump this hash when your dependencies change.
-            # vendorHash = pkgs.lib.fakeHash;
-
             vendorHash = "sha256-dj11SRRoB8ZbkcQs75HPI0DpW4c5jzY0N8MD1wKpw+4=";
           };
         });
 
-      # Add dependencies that are only needed for development
+    nixosModules.photocatalog = { config, lib, pkgs, ... }: {
+          options.photocatalog = {
+            enable = lib.mkEnableOption "Enable photocatalog";
+          };
+
+          config = lib.mkIf config.photocatalog.enable {
+            environment.systemPackages = [ self.photocatalog ];
+          };
+        };
+
       devShells = forAllSystems (system:
         let
           pkgs = nixpkgsFor.${system};
@@ -62,10 +44,6 @@
             buildInputs = with pkgs; [ go gopls gotools go-tools ];
           };
         });
-
-      # The default package for 'nix build'. This makes sense if the
-      # flake provides only one package or there is a clear "main"
-      # package.
       defaultPackage = forAllSystems (system: self.packages.${system}.photocatalog);
     };
 }