Expand terminal filesystem, add mainframe hint cron, redirect PHP logs

- Game1 terminal: flesh out the virtual filesystem with a realistic
  spread of Linux directories/files (~70 dirs, ~140 files) so it no
  longer reads as an obviously small puzzle set, without touching any
  win-condition or rapport files.
- Add app:hints:check command + a php-cron container (BusyBox crond)
  that nudges players who haven't contacted every teammate 5 minutes
  into a session, via a new 'hint' Mercure message type.
- Log the cron command's output to var/log/cron/cron.log and rotate
  it (25MB / 90 days) via logrotate, run daily from the same crontab.
- Redirect PHP's error_log and Symfony's prod app/deprecation logs
  from stderr-only into var/log/php/*.log (kept alongside stderr),
  with the same rotation policy.

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

docker/setup.sh

@@ -143,6 +143,10 @@ Common commands:
   (cd "$DOCKER_DIR" && $DOCKER_COMPOSE logs -f nginx)
   (cd "$DOCKER_DIR" && $DOCKER_COMPOSE logs -f php)
   (cd "$DOCKER_DIR" && $DOCKER_COMPOSE logs -f php-worker)
+  (cd "$DOCKER_DIR" && $DOCKER_COMPOSE logs -f php-cron)       # crond scheduler activity
+  tail -f "$ROOT_DIR/var/log/cron/cron.log"                    # hint-check command output
+  tail -f "$ROOT_DIR/var/log/php/error.log"                    # raw PHP errors
+  tail -f "$ROOT_DIR/var/log/php/prod.log"                     # Symfony app errors (prod only)
   (cd "$DOCKER_DIR" && $DOCKER_COMPOSE exec php bash)
   (cd "$DOCKER_DIR" && $DOCKER_COMPOSE exec php npm run watch)
   (cd "$DOCKER_DIR" && $DOCKER_COMPOSE down)