heather: enable jitsi meet stack (jitsi.iscg.dev)
Стек: web + prosody + jicofo + jvb + coturn. Перенесено с jul11 (2026-07-12):
- config (web/prosody/jicofo/jvb) → named volumes heather_jitsi-{web,prosody,jicofo,jvb,transcripts}
- prosody user mikl.dat сохранён (internal auth)
- образ PIN: stable-11031 (как на jul11, НЕ :latest)
- пароли (jicofo/jvb/jigasi/jibri/turn) НОВЫЕ, в pass iscg.dev/jitsi/
- env-файл /var/lib/jitsi-secrets/jitsi.env (root:docker 0640)
- coturn в host network (real client IPs), realm=turn.iscg.dev
- JVB 10000/udp публично (YC SG уже ANY ANY open)
- Caddy: WebSocket routes /xmpp-websocket, /colibri-ws (hop-by-hop upgrade)
- DISABLE_HTTPS=1 (Caddy терминирует TLS)