feat: setup base

modules/flake/treefmt.nix

@@ -0,0 +1,23 @@
+{ inputs, ... }:
+{
+  imports = [
+    inputs.treefmt-nix.flakeModule
+  ];
+
+  perSystem =
+    {
+      config,
+      pkgs,
+      system,
+      ...
+    }:
+    {
+      treefmt.config = {
+        projectRootFile = "flake.nix";
+        flakeCheck = true;
+        programs = {
+          nixfmt.enable = true;
+        };
+      };
+    };
+}