fix(prompt): add stdin.pause() to prevent process hang after password input

Fixes #236. The password() method called resume() on stdin but never
paused it in cleanup, keeping the event loop alive indefinitely.

src/utils/prompt.ts

@@ -174,6 +174,7 @@ export class InteractivePrompt {
           process.stdin.setRawMode(false);
         }
         process.stdin.removeListener('data', onData);
+        process.stdin.pause();
       };
 
       const onData = (data: Buffer): void => {