chore: align ecosystem to Next.js 16.1.6 and v1.6.0, migrate to ESLint 9 Flat Config

.lintstagedrc.js

@@ -1,9 +1,7 @@
 const path = require('path');
 
 const buildEslintCommand = (filenames) =>
-  `next lint --fix --file ${filenames
-    .map((f) => path.relative(process.cwd(), f))
-    .join(' --file ')}`;
+  `eslint --fix ${filenames.map((f) => path.relative(process.cwd(), f)).join(' ')}`;
 
 module.exports = {
   '*.{js,jsx,ts,tsx}': [buildEslintCommand, 'prettier --write'],