Cocos/Godot 共享场景投影

Host-independent scene projection runtime shared by Cocos and Godot adapters. @quajs/scene-host supplies node, resource, font, audio, input, capture and storage contracts. Narrative/render state stays in engine/store; the renderer reads projections and emits pipeline intents.

Use QuaSceneRendererController, defineSceneRendererPlugin (context.scene) and optional plugins/* or qui entries. This package must not import any target bootstrap adapter. Preserve package-aware asset identity and logical stage coordinates.