Call the webmail inbuxa-webmail in docs and comments

The webmail repository was renamed from ihasmail-inbuxa to inbuxa-webmail
on 2026-10-05. The OAuth client id stays ihasmail-inbuxa: that is what the
server registers, so the backticked and quoted ids are unchanged.

docs/spec/features/scim.md

@@ -679,7 +679,7 @@ SCIM error documents (RFC 7644 §3.12): `schemas`
 
 ## ihasmail changes
 
-These go in ihasmail-inbuxa, not public ihasmail, which stays
+These go in inbuxa-webmail, not public ihasmail, which stays
 Stalwart-facing (SPEC.md §5).
 
 - **Domains:** an "Allow SCIM provisioning" switch on the domain form. Turning