refactor(nix): use flake-parts (#642)

refactor(nix): split into flake parts module and add shell.nix

chore: add prettier to treefmt and pin version

chore(nix): add prettier exclude

chore(nix): bump pnpm to v10.18.2

feat(nix): add overlay for nodejs

feat(nix): add overlay for nodejs

chore: consolidate .editorconfig

nix/devShells.nix

@@ -0,0 +1,30 @@
+{
+  perSystem =
+    {
+      pkgs,
+      ...
+    }:
+    let
+      commonPackages = with pkgs; [
+        nodejs # Defined in overlay
+        pnpm_10 # v10.18.2
+      ];
+
+      additionalPackages = with pkgs; [
+        bun
+        nodePackages.conventional-changelog-cli
+        sentry-cli
+      ];
+    in
+    {
+      devShells.default = pkgs.mkShell {
+        name = "utrp-dev";
+        packages = commonPackages;
+      };
+
+      devShells.full = pkgs.mkShell {
+        name = "utrp-dev-full";
+        packages = commonPackages ++ additionalPackages;
+      };
+    };
+}

nix/treefmt.nix

@@ -0,0 +1,24 @@
+{ inputs, ... }:
+{
+  imports = [
+    inputs.treefmt-nix.flakeModule
+  ];
+
+  perSystem =
+    { pkgs, ... }:
+    {
+      treefmt = {
+        projectRootFile = "flake.nix";
+        programs.nixfmt.enable = pkgs.lib.meta.availableOn pkgs.stdenv.buildPlatform pkgs.nixfmt-rfc-style.compiler;
+        programs.nixfmt.package = pkgs.nixfmt-rfc-style;
+        programs.prettier.enable = true;
+        programs.shellcheck.enable = true;
+        programs.yamlfmt.enable = true;
+        programs.dockerfmt.enable = true;
+
+        settings.formatter.prettier.excludes = [ "pnpm-lock.yaml" ];
+        settings.formatter.shellcheck.excludes = [ ".envrc" ];
+        settings.formatter.yamlfmt.excludes = [ "pnpm-lock.yaml" ];
+      };
+    };
+}