feat: 添加 Arco Design 组件库并重构应用结构，移除 HelloWorld 组件，更新路由配置

src/main.ts

@@ -1,5 +1,10 @@
-import { createApp } from 'vue'
-import './style.css'
-import App from './App.vue'
-
-createApp(App).mount('#app')
+import { createApp } from "vue";
+import ArcoVue from "@arco-design/web-vue";
+import "@arco-design/web-vue/dist/arco.css";
+import "./style.css";
+import App from "./App.vue";
+import router from "./routes/router";
+const app = createApp(App);
+app.use(router);
+app.use(ArcoVue);
+app.mount("#app");