Get Config

Retrieve application configuration settings.<br><br>Returns different configuration based on authentication status:<br>- Authenticated users: Full ConfigResponse with all settings<br>- Unauthenticated users: PublicConfigResponse with limited, safe-to-expose settings<br><br>Args:<br> user: The authenticated user, or None if unauthenticated.<br><br>Returns:<br> ConfigResponse | PublicConfigResponse: Configuration settings appropriate for the user's auth status.<br><br>Raises:<br> HTTPException: If an error occurs while retrieving the configuration.