升级Vue3，iView替换ElementPlus

- 删除babel配置、更新依赖与入口初始化
- 全量替换UI组件、样式适配，新增迁移文档与标签/过滤器自动化替换脚本

im/src/router/index.js

@@ -1,44 +1,38 @@
-import Vue from 'vue'
-import Router from 'vue-router'
-
-Vue.use(Router)
-
-const RouteView = {
-    name: 'RouteView',
-    render: h => h('router-view'),
-}
+import { createRouter, createWebHistory } from "vue-router";
 
 const routes = [
-    {
-        path: '/',
-        name: 'home',
-        component: () => import('@/views/message/index'),
-        meta: {
-            title: '',
-            needLogin: true,
-        },
+  {
+    path: "/",
+    name: "home",
+    component: () => import("@/views/message/index"),
+    meta: {
+      title: "",
+      needLogin: true,
     },
-    {
-        path: '/message',
-        name: 'message',
-        component: () => import('@/views/message/index'),
-        meta: {
-            title: '消息通知',
-            needLogin: true,
-        },
+  },
+  {
+    path: "/message",
+    name: "message",
+    component: () => import("@/views/message/index"),
+    meta: {
+      title: "消息通知",
+      needLogin: true,
     },
-    {
-        path: '*',
-        name: '404 NotFound',
-        component: () => import('@/views/other/404'),
-        meta: {
-            title: '404 NotFound',
-            needLogin: false,
-        },
+  },
+  {
+    path: "/:pathMatch(.*)*",
+    name: "404 NotFound",
+    component: () => import("@/views/other/404"),
+    meta: {
+      title: "404 NotFound",
+      needLogin: false,
     },
-]
+  },
+];
 
-export default new Router({
-    routes,
-    mode: 'history',
-})
+const router = createRouter({
+  history: createWebHistory(),
+  routes,
+});
+
+export default router;