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/main.js

@@ -1,8 +1,9 @@
-import { createApp } from "vue";
-import App from "./App.vue";
-import router from "./router";
-import store from "./store";
-import Antd from "ant-design-vue";
-import "ant-design-vue/dist/reset.css";
+import { createApp } from 'vue'
+import App from './App.vue'
+import router from './router'
+import store from './store'
+import Antd from 'ant-design-vue'
+import 'ant-design-vue/dist/reset.css'
+import '@/style/index.scss'
 
-createApp(App).use(store).use(router).use(Antd).mount("#app");
+createApp(App).use(store).use(router).use(Antd).mount('#app')