* fix(security): redact credential-bearing URLs and PII from logs
Several log statements emitted sensitive data in clear text:
- model_routes / chat_routes / contacts_routes logged endpoint URLs raw.
Admin-configured URLs can embed credentials in userinfo or query
(e.g. https://user:pass@host, ?api_key=...). Route them through a
shared core.log_safety.redact_url() that drops userinfo/query/fragment.
- note_routes / task_scheduler logged operator email addresses (smtp_user,
recipient). Replaced with presence booleans, which keeps the diagnostic
("why didn't this send") without writing PII to logs.
model_routes already had a local redactor on its HTTPStatusError branch;
the generic except branch was missed, so reuse the existing helper there.
Clears CodeQL py/clear-text-logging-sensitive-data alerts 264, 317, 324,
325, 343, 344, 528.
* fix(security): re-bracket IPv6 hosts and single-source the URL redactor
Address review on #4750:
- redact_url now re-brackets IPv6 literals so host:port stays
unambiguous (https://[2001:db8::1]:8443/v1, not the bracket-less
ambiguous form).
- point model_routes._redact_url_for_log at the shared helper so the
two redactors are single-sourced (also picks up the IPv6 fix).
nopoz