Reading Zotero API key at startup causes safe storage prompt in Positron

With the Quarto extension enabled, opening a new Positron window will always result in a prompt like this one, unless you've already granted Positron access to safe storage.

This happens in part because the Quarto extension attempts to access safe storage when the extension starts; when we initialize Zotero as part of extension activation, this happens:

https://github.com/quarto-dev/quarto/blob/57ed6fb2ab6066a6a4f0333c0c968586701e006a/apps/vscode/src/providers/zotero/zotero.ts#L362-L369

Unfortunately just checking for a key in safe storage is enough to trigger an access that results in a prompt. This is unavoidable if we really do need to read a secret, but in most cases we don't. Could we load this API key lazily so the user doesn't get prompted until we use the key, and/or store out-of-band a marker indicating whether there is an API key to read (so we don't hit the storage service unnecessarily when there isn't one)?

Start at apps/vscode/src/providers/zotero/zotero.ts lines 362-369 and trace how Zotero is initialized during extension activation. Reproduce the prompt by opening a new Positron window with the Quarto extension enabled, then verify that safe storage is not accessed until the API key is needed and that existing key behavior still works.