Release 2026.9.24.2

Replaces 2026.9.24, whose tag predates the image build fix (#27) and never
published. Carries everything 2026.9.24 did -- upstream 0.16.23 and its
fixes, the scim release-profile fix -- and since then:

- identifiers renamed from the upstream name, with no aliases: the JMAP
  registry capability is urn:inbuxa:jmap:registry, WebDAV tokens
  urn:inbuxa:dav*, Sieve extensions vnd.inbuxa.*, the web interface client
  inbuxa-webui; INBUXA_* settings only. Deploy with admin and webmail
  releases that use the new names.
- the brand in lowercase where people see it.
- the spam filter rules bundled with the server; on first start they add
  the AI classifier's LLM_* scores.
- a Local AI page link in Settings › Spam Filter, for the admin release
  that draws it.
- two start-up migrations: the spam model moves to its renamed keys, and
  the web interface's old OAuth client is retired.

crates/types/src/branding.rs

@@ -81,7 +81,7 @@ fn legacy_setting(name: &str, is_set: impl Fn(&str) -> bool) -> Option<String> {
 #[macro_export]
 macro_rules! brand_version {
     () => {
-        "2026.9.24"
+        "2026.9.24.2"
     };
 }