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/monitoring.md

@@ -411,7 +411,7 @@ unchanged.
 
 ## ihasmail changes
 
-These go in ihasmail-inbuxa, not public ihasmail, which stays Stalwart-facing
+These go in inbuxa-webmail, not public ihasmail, which stays Stalwart-facing
 (SPEC.md §5).
 
 - The dashboard already reads `x:Metric` for received, sent and memory. Keep