GHSA-5MX2-2MGW-X8RM OpenClaw: BlueBubbles beta plugin webhook auth hardening (remove passwordless fallback)

Summary BlueBubbles webhook auth in the optional beta iMessage plugin allowed a passwordless fallback path. In some reverse-proxy/local routing setups, this could allow unauthenticated webhook events. Affected Component and Scope - Component: extensions/bluebubbles webhook handler - Scope: only...