Add VS Code workspace/launch/settings for Unity development and a new MainMenu scene/UI (uxml, uss, tss) with MainMenuController and related assets. Import two alien character FBX models (with generated .meta settings) and add folder metadata. Update Git LFS pointers for a Game Kit scene and add modifications to Game Kit Controller assets (World Canvas material and Save Camera render texture) and ProjectSettings/QualitySettings. These changes bring initial UI/menu assets and character models into the project and add editor tooling/config for easier development.
Add a new House asset (Assets/Game/House/CasaExample.fbx) with corresponding meta and folder metadata. Adjust World Canvas material (removed _SPECULAR_COLOR, disabled SHADOWCASTER pass, enabled XR motion vectors flag) and update Save Camera RenderTexture serialized settings. Update SampleScene LFS entry and bump Unity package versions in Packages/manifest.json (several dependency version updates). Also update ProjectSettings (project asset/hash and ProjectVersion to 6000.3.8f1).
