requesting a new `sqlite:obo:xyz` input only says "urllib.error.HTTPError: HTTP Error 404: Not Found" if an ontology with abbreviation xyz can't be found

For example, I couldn't retrieve the Experimental Factor Intology and had to figure it out for myself.

```shell
runoak --input sqlite:obo:efi info --output-type tsv .desc//p=i sequencer
```

> urllib.error.HTTPError: HTTP Error 404: Not Found

Start by reproducing the `runoak --input sqlite:obo:efi` command and inspect the input handling behind the `sqlite:obo` scheme. Check how an unavailable ontology abbreviation such as `xyz` becomes an HTTP 404; done means the command reports which abbreviation or ontology could not be found instead of exposing only the raw urllib error.

Written by the indexing model from the issue text.