refactor: migrate demo applications to playground (#4116)

* chore: detail adjustment

* refactor: Migrate demo applications to playground

* perf: logic optimization

* chore: update docs

* chore: update docs

playground/src/locales/langs/zh-CN.json

@@ -0,0 +1,67 @@
+{
+  "page": {
+    "demos": {
+      "title": "演示",
+      "access": {
+        "frontendPermissions": "前端权限",
+        "backendPermissions": "后端权限",
+        "pageAccess": "页面访问",
+        "buttonControl": "按钮控制",
+        "menuVisible403": "菜单可见(403)",
+        "superVisible": "Super 可见",
+        "adminVisible": "Admin 可见",
+        "userVisible": "User 可见"
+      },
+      "nested": {
+        "title": "嵌套菜单",
+        "menu1": "菜单 1",
+        "menu2": "菜单 2",
+        "menu2_1": "菜单 2-1",
+        "menu3": "菜单 3",
+        "menu3_1": "菜单 3-1",
+        "menu3_2": "菜单 3-2",
+        "menu3_2_1": "菜单 3-2-1"
+      },
+      "outside": {
+        "title": "外部页面",
+        "embedded": "内嵌",
+        "externalLink": "外链"
+      },
+      "badge": {
+        "title": "菜单徽标",
+        "dot": "点徽标",
+        "text": "文本徽标",
+        "color": "徽标颜色"
+      },
+      "activeIcon": {
+        "title": "菜单激活图标",
+        "children": "子级激活图标"
+      },
+      "fallback": {
+        "title": "缺省页"
+      },
+      "features": {
+        "title": "功能",
+        "hideChildrenInMenu": "隐藏子菜单",
+        "loginExpired": "登录过期",
+        "icons": "图标",
+        "watermark": "水印",
+        "tabs": "标签页",
+        "tabDetail": "标签详情页"
+      },
+      "breadcrumb": {
+        "navigation": "面包屑导航",
+        "lateral": "平级模式",
+        "level": "层级模式",
+        "levelDetail": "层级模式详情",
+        "lateralDetail": "平级模式详情"
+      }
+    },
+    "examples": {
+      "title": "示例",
+      "ellipsis": {
+        "title": "文本省略"
+      }
+    }
+  }
+}