feat: port duck quack sound (Ya1/Ya2) + system.audio lazy playback on mascot tap

src/pages/index/index.ux

@@ -18,6 +18,28 @@
 </template>
 
 <script>
+// 懒加载 @system.audio，避免模拟器/无扬声器时崩
+let audioModule = null
+let audioTried = false
+function loadAudio() {
+  if (audioTried) return audioModule
+  audioTried = true
+  try {
+    audioModule = require('@system.audio')
+  } catch (e) {
+    audioModule = null
+  }
+  return audioModule
+}
+function playDuckSound() {
+  const a = loadAudio()
+  if (!a) return
+  try {
+    a.src = '/common/Ya1.mp3'
+    a.play()
+  } catch (e) {}
+}
+
 export default {
   private: {
     isPeak: false,
@@ -59,7 +81,8 @@ export default {
   },
 
   onTap() {
-    // Q 弹互动
+    // Q 弹互动 + 小黄鸭叫声（无扬声器时静默）
+    playDuckSound()
     this.tapAnim = true
     const self = this
     setTimeout(() => { self.tapAnim = false }, 400)