- Replace inline get_app_conf secrets in env.j2 with dedicated vars (TURN, signaling, internal)
- Correctly model signaling_servers as object {servers, secret} in spreed.yml
- Use UDP stun_turn port instead of TLS for transport=udp
- Add fallback logic for standalone Coturn role in main.yml
- Remove obsolete Greenlight section from BBB override
Ref: https://chatgpt.com/share/68d74e25-c068-800f-ae20-d0e34ac8ee12