fix unit tests

src/routes/system.routes.test.ts

@@ -12,11 +12,10 @@ vi.mock('util', async (importOriginal) => {
   const actual = await importOriginal<typeof import('util')>();
   return {
     ...actual,
-    default: actual,
     promisify: (fn: Function) => {
       return (...args: any[]) => {
         return new Promise((resolve, reject) => {
-          fn(...args, (err: Error | null, stdout: unknown, stderr: unknown) => {
+          fn(...args, (err: Error | null, stdout: string, stderr: string) => {
             if (err) {
               // Attach stdout/stderr to the error object to mimic child_process.exec behavior
               Object.assign(err, { stdout, stderr });
@@ -41,7 +40,6 @@ vi.mock('child_process', () => {
   });
 
   return {
-    default: { exec: mockExec },
     exec: mockExec,
   };
 });