feat: 引入 yuxiang-kit 课程组件源码与运行时

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/components/course-interactions/drag-drop/DragDropContext.tsx

@@ -0,0 +1,22 @@
+import type { Transform } from "@dnd-kit/utilities";
+import { createContext, useContext } from "react";
+
+interface DragDropContextValue {
+	scale: number;
+	inverseScale: number;
+	hasOverlay: boolean;
+	getScaledTransform: (transform: Transform | null) => Transform | null;
+}
+
+const DragDropContext = createContext<DragDropContextValue>({
+	scale: 1,
+	inverseScale: 1,
+	hasOverlay: false,
+	getScaledTransform: (transform) => transform,
+});
+
+export const DragDropContextProvider = DragDropContext.Provider;
+
+export function useDragDropContext() {
+	return useContext(DragDropContext);
+}