Initiate YouTube OAuth connection. Returns a URL the user must open in their browser.
The user must open the returned URL in their web browser to authorize
Youfiliate to access their YouTube channel. The OAuth callback is handled
in the browser — this tool only returns the authorization URL.
Does NOT read or modify any YouTube data. The OAuth flow is completed
in the user's browser.
Common errors:
- Already connected: disconnect first with `youfiliate_disconnect_youtube`.
ConnectorNo auth