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/package.json

@@ -8,43 +8,43 @@
     "build": "vue-cli-service build",
     "lint": "vue-cli-service lint"
   },
+  "engines": {
+    "node": ">=16"
+  },
   "dependencies": {
+    "@element-plus/icons-vue": "^2.3.1",
     "axios": "^0.21.4",
     "babel-plugin-prismjs": "^2.0.1",
-    "core-js": "^3.6.5",
-    "element-ui": "^2.14.1",
+    "core-js": "^3.36.0",
+    "element-plus": "^2.6.3",
     "js-audio-recorder": "^1.0.6",
     "js-base64": "^2.5.1",
-    "mavon-editor": "^2.10.4",
     "nprogress": "^0.2.0",
     "prismjs": "^1.29.0",
+    "qs": "^6.9.4",
     "svg-sprite-loader": "^5.0.0",
-    "vue": "^2.6.11",
-    "vue-contextmenujs": "^1.3.13",
-    "vue-cropper": "^0.5.5",
-    "vue-prism-editor": "^0.5.1",
-    "vue-router": "^3.4.9",
-    "vue-virtual-scroller": "^1.1.2",
-    "vuex": "^3.5.1"
+    "vue": "^3.4.21",
+    "vue-cropper": "^1.1.1",
+    "vue-prism-editor": "2.0.0-alpha.2",
+    "vue-router": "^4.3.0",
+    "vue-virtual-scroller": "^3.0.4",
+    "vuex": "^4.1.0"
   },
   "devDependencies": {
     "@vue/cli-plugin-babel": "^5.0.8",
     "@vue/cli-plugin-eslint": "^5.0.8",
     "@vue/cli-service": "^5.0.8",
+    "@vue/compiler-sfc": "^3.4.21",
     "babel-eslint": "^10.1.0",
-    "babel-plugin-import": "^1.13.1",
-    "compression-webpack-plugin": "^5.0.0",
+    "compression-webpack-plugin": "^10.0.0",
     "eslint": "^8.28.0",
-    "eslint-plugin-vue": "^6.2.2",
-    "less": "^3.0.4",
-    "less-loader": "^5.0.0",
+    "eslint-plugin-vue": "^9.22.0",
+    "less": "^4.2.0",
+    "less-loader": "^11.1.4",
     "postcss": "^8.4.20",
     "style-resources-loader": "^1.4.1",
     "vue-cli-plugin-style-resources-loader": "^0.1.4",
-    "vue-svg-component-runtime": "^1.0.1",
-    "vue-svg-icon-loader": "^2.1.1",
-    "vue-template-compiler": "^2.6.11",
-    "webpack": "^5.75.0"
+    "webpack": "^5.95.0"
   },
   "eslintConfig": {
     "root": true,
@@ -52,7 +52,7 @@
       "node": true
     },
     "extends": [
-      "plugin:vue/essential",
+      "plugin:vue/vue3-essential",
       "eslint:recommended"
     ],
     "parserOptions": {