feat(web): 初始化主页面和监控页面

- 新增 MainView 组件，包含 header、menu 和 page 区域
- 新增 monitor 子页面组件
- 更新路由配置，添加主页面和监控页面路由
- 新增全局样式文件，统一颜色和样式
- 优化 App.vue 样式，移除最小宽高限制

web/src/views/MainView.vue

@@ -1,7 +1,15 @@
 <template>
   <div class="main">
-   <div class="header"></div>
-   <div class="menu"></div>
+    <div class="header"></div>
+    <div class="page">
+      <router-view/>
+    </div>
+    <div class="menu">
+      <div v-for="menu in menuList" :key="menu.name" class="menu-item">
+        <i :class="menu.icon"></i>
+        {{ menu.name }}
+      </div>
+    </div>
   </div>
 </template>
 
@@ -9,7 +17,75 @@
 // @ is an alias to /src
 
 export default {
-  name: "MainView",
+  name: 'MainView',
   components: {},
-};
+  data() {
+    return {
+      menuList: [
+        {
+          name: '系统总览',
+          icon: 'icon-xitongguanli'
+        },
+        {
+          name: '系统管理',
+          icon: 'icon-xitongguanli',
+          children: [
+            {
+              name: '用户管理',
+              icon: 'icon-yonghuguanli',
+              children: [
+                {
+                  name: '用户列表',
+                  icon: 'icon-yonghuguanli',
+                  path: '/user/list'
+                }
+              ]
+            }
+          ]
+        }
+      ]
+    }
+  }
+}
 </script>
+<style lang="scss" scoped>
+.main {
+  width: 100%;
+  height: 100%;
+  background-image: url('@/assets/images/mainBg.png');
+  background-size: 100% 100%;
+  background-repeat: no-repeat;
+}
+.header { 
+  width: 100%;
+  height: 80px;
+  border: 1px solid red;
+}
+.page{
+  width: calc(100% - 20px);
+  height: calc(100% - 80px - 15px - 47px - 60px);
+  margin: 40px 10px 20px 10px;
+  border-radius: 20px;
+background: #052F4D;
+
+}
+.menu {
+  position: absolute;
+  width: 100%;
+  bottom: 15px;
+  // height: 150px;
+  display: flex;
+  justify-content: center;
+  .menu-item {
+    width: 120px;
+    height: 47px;
+    line-height: 47px;
+    text-align: center;
+    border-radius: 20px;
+    background: #04608e;
+    color: #fff;
+    font-size: 20px;
+    font-weight: 700;
+  }
+}
+</style>

web/src/views/sub/monitor.vue

@@ -0,0 +1,27 @@
+<template>
+    <div class="monitor">
+        <div class="search">
+            <div class="left">
+                <div class="search-item">
+                    <span>场站切换</span>
+                    <a-cascader v-model:value="value" :options="options" placeholder="Please select" />
+                </div>
+            </div>
+            <div class="right"></div>
+        </div>
+
+    </div>
+</template>
+
+<script setup>
+</script>
+
+<style scoped lang="scss">
+.monitor{
+    padding: 10px;
+    .search{
+        display: flex;
+        justify-content: space-between;
+    }
+}
+</style>