feat: accessibility settings, subtitle/QTE improvements, docs update

engine/systems/QTESystem.ts

@@ -4,14 +4,13 @@ type QTEUpdateCallback = (remaining: number, total: number) => void
 type QTEResultCallback = (success: boolean) => void
 
 export class QTESystem {
-  // QTE (Quick Time Event / 快速反应事件):
-  // 视频播放到特定时间点时弹出按键提示，玩家在倒计时内按下指定按键，
-  // 成功/失败/超时分别导向不同剧情分支，并应用对应的 effects 效果。
   private timerId: ReturnType<typeof setInterval> | null = null
   private timeoutId: ReturnType<typeof setTimeout> | null = null
   private keyHandler: ((e: KeyboardEvent) => void) | null = null
   private tickMs = 50
   private active = false
+  timeLimitMultiplier = 1
+  singleKeyMode = false
 
   trigger(
     qte: QTEDefinition,
@@ -22,11 +21,13 @@ export class QTESystem {
     this.active = true
 
     const startTime = Date.now()
-    const total = qte.timeLimit * 1000
+    const adjustedLimit = qte.timeLimit * this.timeLimitMultiplier
+    const total = adjustedLimit * 1000
 
     this.keyHandler = (e: KeyboardEvent) => {
       if (!this.active) return
-      const matched = qte.keys.some(
+      const targetKeys = this.singleKeyMode ? [' '] : qte.keys
+      const matched = targetKeys.some(
         (k) => k.toLowerCase() === e.key.toLowerCase()
       )
       if (matched) {
@@ -40,7 +41,7 @@ export class QTESystem {
       if (!this.active) return
       const elapsed = Date.now() - startTime
       const remaining = Math.max(0, total - elapsed)
-      onUpdate(remaining / 1000, qte.timeLimit)
+      onUpdate(remaining / 1000, adjustedLimit)
       if (remaining <= 0) {
         this.clear()
         onResult(false)