Enabling the MSC4143 experimental feature without configuring any transports makes Synapse serve an empty response on the RTC transports API. Clients treat that response as authoritative and do not fall back to the org.matrix.msc4143.rtc_foci property in the client well-known, breaking Element Call with a MISSING_MATRIX_RTC_TRANSPORT error.

This makes the playbook wire the LiveKit JWT service URL into the new matrix_rtc.transports Synapse setting, matching what continuwuity, tuwunel and the client well-known already advertise.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/5522

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>