feat: 添加 PWA 下载页面和路由配置；更新 PWA 图标设置

src/router/index.ts

@@ -204,6 +204,10 @@ const routes: Array<RouteRecordRaw> = [
     path: "/global-menu",
     component: () => import("@/views/global-menu/index.vue"),
   },
+  {
+    path: "/pwa_download",
+    component: () => import("@/views/pwa/download.vue"),
+  },
 ];
 
 const router = createRouter({