fix: allow pushing to auto routes

Fix #2656

Author: posva

packages/router/vue-router-auto-routes.d.mts

@@ -3,7 +3,7 @@ import type { Router, RouteRecordRaw } from 'vue-router'
 /**
  * Array of routes generated by vue-router file based routing
  */
-export declare const routes: readonly RouteRecordRaw[]
+export declare const routes: RouteRecordRaw[]
 
 /**
  * Setups hot module replacement for routes.