openapi generator mcp routes

By the way, can we how to integrate into the root openapi, mcp routes?

```ts
// root hono server
app.get(
  `/openapi`,
  openAPISpecs(app, {
    documentation: {
      info: {
// ...
```

example:

![Image](https://github.com/user-attachments/assets/15ea0117-ffc9-4199-90e7-291feb661295)