feat: 闯关页场景/拼音/朗读/互动分发集成，学堂弹层注音朗读

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ui-src/src/store/user.js

@@ -2,6 +2,7 @@ import { reactive } from 'vue'
 
 const AUTH_KEY = '36wisdom_auth'
 const CHILD_KEY = '36wisdom_child'
+const AGE_KEY = '36wisdom_child_age'
 
 function loadAuth() {
   const saved = uni.getStorageSync(AUTH_KEY)
@@ -46,3 +47,11 @@ export function clearAuth() {
   state.parentId = 0
   uni.removeStorageSync(AUTH_KEY)
 }
+
+export function getChildAge() {
+  return uni.getStorageSync(AGE_KEY) || '4-6'
+}
+
+export function setChildAge(age) {
+  uni.setStorageSync(AGE_KEY, age)
+}