feat(scaffold): update eslint config to flat

Author: YusukeHirao

packages/@d-zero/scaffold/.eslintrc.cjs

@@ -0,0 +1,19 @@
+import dz from '@d-zero/eslint-config';
+
+/**
+ * @type {import('eslint').Linter.Config[]}
+ */
+export default [
+	...dz.configs.node,
+	...dz.configs.frontend.map((config) => ({
+		files: ['__assets/**/*'],
+		...config,
+	})),
+	{
+		files: ['**/*.cjs', '**/.textlintrc.js'],
+		...dz.configs.commonjs,
+	},
+	{
+		ignores: ['htdocs/**/*'],
+	},
+];