fix(h5): 修复小程序 WebView 内 logo 与备案号展示

Logo 改用 BASE_URL 路径并在 embed 模式始终显示顶部栏；备案号改为页面底部文档流，避免悬浮遮挡内容。

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

apps/user-h5/src/App.vue

@@ -1,22 +1,19 @@
 <template>
   <div class="app-shell" :class="{ 'mp-embed': mpEmbed }">
-    <AppHeader v-if="!mpEmbed || showEmbedHeader" />
-    <router-view />
+    <div class="app-body">
+      <AppHeader />
+      <router-view />
+    </div>
     <IcpFooter />
     <TabBar v-if="!mpEmbed" />
   </div>
 </template>
 
 <script setup lang="ts">
-import { computed } from 'vue'
-import { useRoute } from 'vue-router'
 import AppHeader from './components/AppHeader.vue'
 import IcpFooter from './components/IcpFooter.vue'
 import TabBar from './components/TabBar.vue'
 import { isMpEmbed } from './lib/mpEmbed'
 
-const route = useRoute()
 const mpEmbed = isMpEmbed()
-/** Sub-pages in web-view: show back only; home hides duplicate chrome. */
-const showEmbedHeader = computed(() => mpEmbed && route.path !== '/')
 </script>