Complete remaining VN module work: Mesh morph targets from Assimp with GPU bake, built-in NullLive2DBackend plus plugin registration sample, Dialogue typewriter lip-sync, and Avatar tween binding. Co-authored-by: 西风逍遥游 <sunxfancy@gmail.com>
Add eve.Dialogue (typewriter, choices, stage slots) driven by Squirrel scripts/generators without a new DSL, and eve.Avatar with Image layer composition plus pluggable Live2D and VRoid backends. Co-authored-by: 西风逍遥游 <sunxfancy@gmail.com>