refactor(layout): 调整首页布局和路由配置

- 移除 AppMain 组件中的条件类名,去除index页高度100vh覆盖头部和navbar隐藏
- 头部大屏更换为概览页，大屏改为新页面打开
- 移除 Layout 组件中的动态样式

src/layout/components/AppMain.vue

@@ -1,5 +1,6 @@
 <template>
-  <section id="con_lf_top_div" :class="key==='/index'?'h100vh':''" class="app-main">
+<!--  <section id="con_lf_top_div" :class="key==='/index'?'h100vh':''" class="app-main">-->
+  <section id="con_lf_top_div" class="app-main">
     <transition mode="out-in" name="fade-transform">
       <keep-alive :include="cachedViews">
         <router-view :key="key" />

src/layout/index.vue

@@ -3,7 +3,7 @@
     <div v-if="device==='mobile'&&sidebar.opened" class="drawer-bg" @click="handleClickOutside"/>
     <sidebar class="sidebar-container" />
     <div :class="{hasTagsView:needTagsView}" class="main-container">
-      <div id="navbar-top" :class="{'fixed-header':fixedHeader}" :style="navbarShow() ? 'display: none;' : ''">
+      <div id="navbar-top" :class="{'fixed-header':fixedHeader}">
         <navbar />
         <tags-view v-if="needTagsView" />
       </div>

src/router/index.js

@@ -88,20 +88,9 @@ export const constantRoutes = [
     component: Layout,
     redirect: 'index',
     children: [
-      {
-        path: '/index',
-        component: (resolve) => require(['@/views/bigScreenIframe/index'], resolve),
-        name: 'BigScreen',
-        meta: {
-          title: '监控大屏', icon: 'dashboard', noCache: true, affix: true
-        },
-        params: {
-          showNav: false
-        }
-      },
       // {
       //   path: '/index',
-      //   component: (resolve) => require(['@/views/index'], resolve),
+      //   component: (resolve) => require(['@/views/bigScreenIframe/index'], resolve),
       //   name: 'BigScreen',
       //   meta: {
       //     title: '监控大屏', icon: 'dashboard', noCache: true, affix: true
@@ -110,6 +99,14 @@ export const constantRoutes = [
       //     showNav: false
       //   }
       // },
+      {
+        path: '/index',
+        component: (resolve) => require(['@/views/index'], resolve),
+        name: 'BigScreen',
+        meta: {
+          title: '监控大屏', icon: 'dashboard', noCache: false, affix: false
+        },
+      },
     ]
   },
   {