Async Asset Loading via FStreamableManager

Goal: Load massive assets (like 4K textures or skeletal meshes) in the background without freezing the main thread.

1. Include Engine/AssetManager.h in your class.
2. Get the singleton: UAssetManager& AssetManager = UAssetManager::Get();
3. Define a FSoftObjectPath pointing to your asset.
4. Call AssetManager.GetStreamableManager().RequestAsyncLoad(), passing a delegate callback to execute when the memory is ready.