feat: initialization migration to Nuxt + Backend

This commit initializes both the Nuxt frontend and the Rust backend of
the new version of phundrak.com

frontend/shell.nix

@@ -0,0 +1,54 @@
+{
+  inputs,
+  pkgs,
+  self,
+  ...
+}:
+inputs.devenv.lib.mkShell {
+  inherit inputs pkgs;
+  modules = [
+    {
+      devenv.root = let
+        devenvRootFileContent = builtins.readFile "${self}/.devenv-root";
+      in
+        pkgs.lib.mkIf (devenvRootFileContent != "") devenvRootFileContent;
+    }
+    {
+      env.PNPM_HOME = "${self}/.pnpm-store";
+
+      packages = with pkgs; [
+        # LSP
+        nodePackages."@tailwindcss/language-server"
+        vscode-langservers-extracted
+        vue-language-server
+
+        rustywind
+        nodePackages.prettier
+        nodePackages.eslint
+
+        # Node
+        nodejs_24
+        nodePackages.pnpm
+
+        # Typescript
+        typescript
+        nodePackages.typescript-language-server
+      ];
+
+      enterShell = ''
+        echo "🚀 Nuxt.js development environment loaded!"
+        echo "📦 Node.js version: $(node --version)"
+        echo "📦 pnpm version: $(pnpm --version)"
+        echo ""
+        echo "Available LSP servers:"
+        echo "  - typescript-language-server (TypeScript)"
+        echo "  - vue-language-server (Vue/Volar)"
+        echo "  - tailwindcss-language-server (Tailwind CSS)"
+        echo "  - vscode-langservers-extracted (HTML, CSS, JSON, ESLint)"
+        echo ""
+        echo "Run 'pnpm install' to install dependencies"
+        echo "Run 'pnpm dev' to start the development server"
+      '';
+    }
+  ];
+}