chore(eslint): replace no-restricted-imports with no-restricted-syntax for require() compat

eslint.config.mjs

@@ -72,19 +72,16 @@ export default [
     files: ['routes/**/*.cts'],
     ignores: ['routes/transactions.cts', 'routes/import.cts'],
     rules: {
-      'no-restricted-imports': [
+      // no-restricted-imports can't see require() — match the call itself.
+      'no-restricted-syntax': [
         'error',
         {
-          paths: [
-            {
-              name: '../middleware/errorFormatter.cts',
+          selector: "CallExpression[callee.name='require'] Literal[value=/errorFormatter/]",
           message:
             'Routes emit errors by throwing utils/apiError.cts factories (see CODE_STANDARDS.md); the terminal handler formats them.',
         },
       ],
     },
-      ],
-    },
   },
   {
     files: ['client/**/*.{js,jsx}'],