perf: 将本地图标全部按需引入，首屏加载减少 61 个图标资源，首屏加载再次变快 (#389)

* perf: 优化图标，将本地图标按需引入，首屏加载减少 `61` 个图标资源，首屏加载再次变快

src/router/modules/nested.ts

@@ -1,12 +1,13 @@
 import { $t } from "@/plugins/i18n";
 import { nested } from "@/router/enums";
+import Histogram from "@iconify-icons/ep/histogram";
 
 export default {
   path: "/nested",
   redirect: "/nested/menu1/menu1-1",
   meta: {
     title: $t("menus.hsmenus"),
-    icon: "histogram",
+    icon: Histogram,
     rank: nested
   },
   children: [