feat: point the fleet at wss LiveKit room uwh-telhai

Publish and subscribe over wss://livekit.uni-wh.de:7800 and refuse
cleartext ws://. Conference room is uwh-telhai. Includes the uncommitted
encoded H.264 publish path, Rally hairpin, and KMS wall overlay.

deploy/livekit-displays.service

@@ -1,8 +1,10 @@
 [Unit]
 Description=Drive 3 DRM displays with LiveKit camera output (GStreamer kmssink)
 Documentation=file:///home/fdenkena/livekit-cameras/README.md
-After=network-online.target livekit-server.service livekit-cameras.service
-Wants=network-online.target livekit-cameras.service
+After=network-online.target
+Wants=network-online.target
+# Do not After=/Wants= livekit-cameras: the wall must stay up when cameras
+# are missing and when the SFU is down (on-screen error, then reconnect).
 
 [Service]
 Type=simple
@@ -10,7 +12,7 @@ WorkingDirectory=/home/fdenkena/livekit-cameras
 EnvironmentFile=-/home/fdenkena/livekit-cameras/.env
 Environment=PYTHONUNBUFFERED=1
 # Exclusive KMS access — no X/Wayland on these connectors.
-ExecStartPre=/home/fdenkena/livekit-cameras/deploy/wait-for-livekit.sh
+# Start kmssink immediately; run_displays.py shows LiveKit errors on the wall.
 ExecStart=/home/fdenkena/livekit-cameras/.venv/bin/python /home/fdenkena/livekit-cameras/run_displays.py
 ExecStop=/bin/kill -TERM $MAINPID
 Restart=always