Settings › Security gains Hardening, the legacy protocols screen

Adds a link to CustomComponent/LegacyProtocols in the packaged schema's
Settings › Security, between Settings and Blocked IPs, and updates the
schema hash so admins fetch the new layout rather than a cached one.

INBUXA Admin draws the screen; this is what makes it reachable. An admin
from before that screen would show "Unknown component" here, so this
lands after the admin release that carries it.

resources/schema/schema.json.sha256

@@ -1 +1 @@
--DHPbeChvvEHbLbAO3wDU6KCP8HrzaWZHfkka30YoIU
+nuvjIy1CjdKzUWRaCOjYVxDDThjb3eTz-7viHfo4lfM