PR1 – Backend Foundation (50) [merged]
Per-room engine – Independent interpretation for every room.
Backend framework – Pluggable interpreter support (SUSI/None).
Session control – Shared start, stop, and update logic.
Stream detection – Auto-detects room livestream.
PR2 – Room Management (54)
Per-room credentials – Separate SUSI login for each room.
Video Admin API – APIs to configure and control sessions.
Room settings – UI for room configuration and sign-in.
PR3 – Organizer Experience (56)
Overview dashboard – Event and room interpretation status.
Caption preview – Test live captions before use.
Organizer workflow – Overview → Settings → Preview.
• Merge order: PR1 → PR2 → PR3