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/php/Dockerfile

@@ -12,7 +12,8 @@ RUN apk add --no-cache \
     make \
     nodejs \
     npm \
-    shadow
+    shadow \
+    logrotate
 
 # Install PHP extension installer
 COPY --from=mlocati/php-extension-installer /usr/bin/install-php-extensions /usr/local/bin/
@@ -41,6 +42,15 @@ COPY --from=composer:2 /usr/bin/composer /usr/bin/composer
 # Configure PHP
 COPY docker/php/php.ini $PHP_INI_DIR/conf.d/zz-custom.ini
 
+# Cron daemon (BusyBox's built-in crond) for the php-cron container.
+# Harmless for the php/php-worker containers too, since they never invoke crond.
+COPY docker/php/crontab /etc/crontabs/root
+RUN chmod 0600 /etc/crontabs/root
+
+# Log rotation for the cron hint-check and PHP error logs: 25MB per file, kept for 3 months.
+COPY docker/php/logrotate/cron-hints.conf /etc/logrotate.d/cron-hints
+COPY docker/php/logrotate/php-logs.conf /etc/logrotate.d/php-logs
+
 # Adjust www-data UID/GID to match host user (default 1000)
 ARG USER_ID=1000
 ARG GROUP_ID=1000
@@ -56,7 +66,7 @@ RUN if [ ${USER_ID:-0} -ne 0 ] && [ ${GROUP_ID:-0} -ne 0 ]; then \
 WORKDIR /var/www/html
 
 # Set permissions for Symfony directories
-RUN mkdir -p var/cache var/log var/sessions && \
+RUN mkdir -p var/cache var/log/cron var/log/php var/sessions && \
     chown -R www-data:www-data var
 
 # Default command