openai/gpt-chat-latest → A (3:2)

Side A fixes a real deployment and correctness issue by centralizing base URL generation in `app.util/get-base-url`, replacing scattered hardcoded host/environment logic across multiple OAuth/login callback paths, using `window.location.origin` on the frontend, and updating the deployment workflow to deploy from `staging`. Side B adds a useful `room create` CLI command and simplifies room handling by removing unused visibility state, but much of the patch is API/docs plumbing and feature exposure rather than fixing cross-environment correctness problems.