refactor(nix): move style app wiring into dotfiles

flake.nix

@@ -75,42 +75,10 @@
   };
 
   outputs =
-    {
-      self,
-      nixpkgs,
-      treefmt-nix,
-      ...
-    }@inputs:
-    let
-      system = "x86_64-linux";
-      pkgs = nixpkgs.legacyPackages.${system};
-      treefmtEval = treefmt-nix.lib.evalModule pkgs ./treefmt.nix;
-      nixStyleCheck = pkgs.writeShellApplication {
-        name = "nix-style-check";
-        runtimeInputs = [
-          treefmtEval.config.build.wrapper
-          pkgs.statix
-          pkgs.deadnix
-        ];
-        text = ''
-          treefmt --fail-on-change
-          statix check .
-          deadnix --fail --no-lambda-pattern-names --no-underscore .
-        '';
-      };
-    in
-    {
-      formatter.${system} = treefmtEval.config.build.wrapper;
-
-      apps.${system}.nix-style-check = {
-        type = "app";
-        program = "${nixStyleCheck}/bin/nix-style-check";
-      };
-
-      nixosConfigurations = (import ./src/dotfiles {
-        inherit inputs self;
-        lib = nixpkgs.lib;
-        root = ./configs/nixos;
-      }).nixosConfigurations;
+    { self, nixpkgs, ... }@inputs:
+    import ./src/dotfiles {
+      inherit inputs self;
+      lib = nixpkgs.lib;
+      root = ./configs/nixos;
     };
 }