Add full Docker deployment: setup.sh, update.sh, healthcheck, TURN support

- setup.sh: interactive/non-interactive one-shot installer (build, DB
  healthcheck, migrate, seed, start), idempotent secret generation, NPM
  reverse-proxy network auto-detection and optional join, optional
  AUTO_UPDATE cron install.
- update.sh: release-tag-gated updates only (never bare main), DB backup
  with retention before every update, lock file against concurrent runs,
  automatic code rollback on failed post-update healthcheck.
- Dockerfile: multi-stage build, non-root user, built-in HEALTHCHECK against
  the new /api/health route, wholesale COPY so new source dirs (e.g.
  scripts/) never silently go missing at runtime.
- docker-compose.yml: internal anouma-network (configurable), named volume
  for Postgres, app depends_on postgres healthy, no unnecessary published
  ports; docker-compose.override.yml.example documents joining an existing
  NPM network without ever touching NPM itself.
- Fix host-detection: isHost was Boolean(user), wrongly granting host
  privileges to logged-in customers; now checks user.collection === "users".
- Wire configurable STUN/TURN servers through to the WebRTC client
  (lib/meeting/iceServers.ts) so a TURN server can be added later via env
  vars only, no code changes.
- DEPLOYMENT.md, updated README.md and .env.example documenting the whole
  flow: NPM integration, env vars, WebRTC, updates, backups, rollback.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.dockerignore

@@ -0,0 +1,15 @@
+node_modules
+.next
+.git
+.env
+.env.*
+!.env.example
+media
+backups
+*.log
+*.tsbuildinfo
+*.rpm
+*.deb
+*.AppImage
+README.md
+DEPLOYMENT.md