quoted braces should not affect caddyfile block parsing

### Issue Details

right now, this caddyfile fails

```caddyfile
:8080 {
	respond "{"
}
```

i think it would be correct to ignore quoted "{" and "}" as open/close characters for block parsing

### Assistance Disclosure

AI used

### If AI was used, describe the extent to which it was used.

ai discovered while working on a different feature