feat: engine improvements, new scenes, videos, subtitles, hotspot component and docs update

engine/types.ts

@@ -1,8 +1,11 @@
 export interface SceneNode {
   id: string
+  type?: 'video' | 'image'
   videoUrl: string
+  imageUrl?: string
   subtitleUrl?: string
   choices?: Choice[]
+  hotspots?: Hotspot[]
   qte?: QTEDefinition
   nextScene?: string
   onEnter?: Effect[]
@@ -13,7 +16,22 @@ export interface Choice {
   targetScene: string
   conditions?: Condition[]
   effects?: Effect[]
-  timeLimit?: number // 单位：秒，超时后自动选择第一项
+  timeLimit?: number
+}
+
+export interface Hotspot {
+  id: string
+  label: string
+  targetScene: string
+  x: number
+  y: number
+  width: number
+  height: number
+  showAt?: number
+  hideAt?: number
+  conditions?: Condition[]
+  effects?: Effect[]
+  timeLimit?: number
 }
 
 export interface Condition {
@@ -73,3 +91,5 @@ export type EngineEvent =
   | 'qteResult'
   | 'videoEnd'
   | 'choiceTimeout'
+  | 'hotspotRequest'
+  | 'hotspotUpdate'