refactor(router): 重命名路由插件文件并更新类型定义

src/plugins/10.unhead.ts

@@ -0,0 +1,5 @@
+import { createHead } from '@unhead/vue/client';
+
+export function install({ app }: { app: import('vue').App<Element> }) {
+  app.use(createHead());
+}