refactor(projects): 优化路由导入页面写法，页面路由调整

src/views/system/index.ts

@@ -0,0 +1,6 @@
+import Login from './login/index.vue';
+import NoPermission from './exception/403.vue';
+import NotFound from './exception/404.vue';
+import ServiceError from './exception/500.vue';
+
+export { Login, NoPermission, NotFound, ServiceError };