iterate over each zod issue

```javascript
if (error instanceof z.ZodError){
  reply.code(400).send({
    status: false,
    message: error.issues[0].message,
    invalidFields: error.issues[0].path[0]
  })
}
```
We are statically sending back one issues but...

> Each ZodError has an issues property that is an array of ZodIssues. Each issue documents a problem that occurred during validation.