Missing [Internal] projects for auth com.firebase.example.internal

There is no folder named "internal", 

the quickstart [auth] can't even being sync in Gradle.

<img width="1027" height="540" alt="Image" src="https://github.com/user-attachments/assets/57d937e4-17e7-4f35-b28c-e99795a00149" />

```
com.firebase.example.internal package not found.
```