refactor: add home 'allowedUnfree' option

modules/audio/default.nix

@@ -1,6 +1,9 @@
-_:
-
 {
+  nixpkgs.allowedUnfree = [
+    "spotify"
+    "spotify-unwrapped"
+  ];
+
   security.rtkit.enable = true;
   services = {
     pulseaudio.enable = false;

modules/common/default.nix

@@ -1,58 +1,66 @@
-let
-  flakePath = "/home/h/nix";
-in
 {
   inputs,
   outputs,
   dotsPath,
+  config,
   ...
 }:
 
+let
+  inherit (inputs.nixpkgs) lib;
+in
 {
   imports = [
     inputs.home-manager.nixosModules.default
   ];
 
-  system.stateVersion = "25.05";
-
-  nix.settings.experimental-features = [
-    "nix-command"
-    "flakes"
-  ];
-
-  nixpkgs.config.allowUnfree = true;
-
-  home-manager = {
-    useGlobalPkgs = true;
-    useUserPackages = true;
-    extraSpecialArgs = {
-      inherit inputs outputs dotsPath;
-    };
+  options.nixpkgs.allowedUnfree = lib.mkOption {
+    type = lib.types.listOf lib.types.str;
+    default = [ ];
   };
 
-  nix = {
-    optimise = {
-      automatic = true;
-      dates = [ "05:00" ];
-    };
-    gc = {
-      automatic = true;
-      dates = "weekly";
-      options = "--delete-older-than 30d";
-    };
-  };
+  config = {
+    system.stateVersion = "25.05";
 
-  system.autoUpgrade = {
-    enable = true;
-    flake = flakePath;
-    flags = [
-      "--recreate-lock-file"
-      "--commit-lock-file"
-      "--print-build-logs"
-      "--refresh"
+    nix.settings.experimental-features = [
+      "nix-command"
+      "flakes"
     ];
-    dates = "05:00";
-    randomizedDelaySec = "45min";
-    allowReboot = false;
+
+    nixpkgs.config.allowUnfreePredicate =
+      pkg: builtins.elem (lib.getName pkg) config.nixpkgs.allowedUnfree;
+
+    home-manager = {
+      useGlobalPkgs = true;
+      useUserPackages = true;
+      extraSpecialArgs = {
+        inherit inputs outputs dotsPath;
+      };
+    };
+
+    nix = {
+      optimise = {
+        automatic = true;
+        dates = [ "05:00" ];
+      };
+      gc = {
+        automatic = true;
+        dates = "weekly";
+        options = "--delete-older-than 30d";
+      };
+    };
+
+    system.autoUpgrade = {
+      enable = true;
+      flags = [
+        "--recreate-lock-file"
+        "--commit-lock-file"
+        "--print-build-logs"
+        "--refresh"
+      ];
+      dates = "05:00";
+      randomizedDelaySec = "45min";
+      allowReboot = false;
+    };
   };
 }