fix(h5): 修复 WebView 顶栏 logo 与内容重叠

embed 模式 header 改文档流、移除负 margin；持久化 sbh 并在路由中保留，避免胶囊区与档案条重叠。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/user-h5/src/router/index.ts

@@ -50,8 +50,20 @@ const router = createRouter({
 })
 
 router.beforeEach((to) => {
-  if (!isMpEmbed() || to.query.mp === '1') return true
-  return { path: to.path, query: { ...to.query, mp: '1' }, hash: to.hash, replace: true }
+  if (!isMpEmbed()) return true
+  const q = { ...to.query }
+  let changed = false
+  if (q.mp !== '1') {
+    q.mp = '1'
+    changed = true
+  }
+  const storedSbh = sessionStorage.getItem('yxg_sbh')
+  if (storedSbh && q.sbh !== storedSbh) {
+    q.sbh = storedSbh
+    changed = true
+  }
+  if (!changed) return true
+  return { path: to.path, query: q, hash: to.hash, replace: true }
 })
 
 export default router