Revert entrypoint.sh to main — Xvfb handled there independently

docker/entrypoint.sh

@@ -17,9 +17,6 @@ if [ -z "$ROOM_CAL_API_URL" ] && [ -f "$ROOM_CAL_DATA_HOME/config.json" ]; then
 fi
 export ROOM_CAL_API_URL
 
-Xvfb :99 -screen 0 1280x720x24 -ac &
-export DISPLAY=:99
-
 SERVICE="${1:-api}"
 
 # MCP