phsl / new-api

This commit refactors the login and registration forms to enhance user experience by conditionally displaying OAuth-related UI elements.

- In `LoginForm.js` and `RegisterForm.js`:
    - The "Other login/registration options" button and the "or" divider are now only displayed if at least one OAuth provider is enabled in the system settings.
    - This change ensures a cleaner interface when no OAuth options are configured, preventing user confusion.
- In `RegisterForm.js`:
    - Changed `div` class from `relative` to `min-h-screen relative` to ensure the registration form an take up the entire screen height.