- /api/ice: when TURN_SECRET is set, mint short-lived HMAC credentials
  (coturn use-auth-secret) so no permanent password is exposed and the relay
  can't be abused. Static TURN_USERNAME/CREDENTIAL still supported.
- share.html: connection watchdog + clear "couldn't connect on this network"
  message instead of a blank screen when no path can be established.
- deploy/coturn: ready-to-run turnserver.conf + docker-compose + README for
  hosting our own TURN on a VM we own (flat cost, no per-GB billing).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

TURN relay candidates were applied only when IS_MOBILE, leaving desktop
clients STUN-only. Customers behind symmetric NAT / corporate firewalls /
VPNs then couldn't establish the peer connection -> connectionState 'failed'
-> "connection lost" -> blank screen right after granting permissions. This
hit only some users (those needing a relay).

Apply the /api/ice config (STUN + managed TURN) regardless of device, in both
the customer (share.html) and agent (connect.html) flows. Requires TURN_URLS /
TURN_USERNAME / TURN_CREDENTIAL to be set in the production environment.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

User-facing
- New post-login home (/home): chat rail + Share/Connect (embedded) + Meeting; login lives here when logged out
- Landing: "Log in with BizGaze" + no-login screen share
- Console replaced by a role-scoped Dashboard (/dashboard): admins see all team sessions, others see only their own; stats + CSV/PDF export
- Recordings saved as MP4 (H.264/AAC) with WebM fallback; old .webm still downloadable
- Fix: duplicate "Sign in" on the login card

Auth / integration
- BizGaze as identity provider: /api/login validates against BIZGAZE_LOGIN_URL (env-gated) and provisions a local user
- Phase 2 start: /api/v1 alias for all /api routes; Authorization: Bearer accepted across HTTP + WS; login returns a token (for native desktop/mobile clients)

Backend refactor (Phase 1, behavior-preserving)
- Split server.js into config/lib/session/presence/routes/static/signaling + repos (data-access) + bizgaze (service)
- All SQL behind repos.js, tenant-scoped (tenantId == team_id for now)
- e2e updated to current flow (21/21 pass before and after)

Docs: ARCHITECTURE.md (target architecture + phased plan), CLAUDE.md repo layout, .env.example BIZGAZE_LOGIN_URL

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

- server: /api/ice endpoint reads TURN creds from env (TURN_URLS/USERNAME/CREDENTIAL)
- share/connect: load ICE config at page open
- fixes: stop icon, bright chat notification, beep audio-unlock,
  customer screen cleanup on session end, Home link, Remember-me on agent login, Time spent fixed from 90 seconds to actual time spent