The org.matrix.msc4143.rtc_foci property has been dropped from MSC4143 and
Element Call v0.24.0 no longer reads it, so the homeserver's own RTC
transports API is left as the single source of truth. Synapse, continuwuity
and tuwunel all serve it at the unstable path which clients request.

Keeping both around also made Element Web list the same LiveKit transport
twice, as it merges the two sources without deduplicating them.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>