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>

config/packages/monolog.yaml

@@ -47,6 +47,14 @@ when@prod:
                 excluded_http_codes: [404, 405]
                 buffer_size: 50 # How many messages should be saved? Prevent memory leaks
             nested:
+                type: group
+                members: [nested_file, nested_stderr]
+            nested_file:
+                type: stream
+                path: "%kernel.logs_dir%/php/prod.log"
+                level: debug
+                formatter: monolog.formatter.json
+            nested_stderr:
                 type: stream
                 path: php://stderr
                 level: debug
@@ -56,7 +64,14 @@ when@prod:
                 process_psr_3_messages: false
                 channels: ["!event", "!doctrine"]
             deprecation:
-                type: stream
+                type: group
                 channels: [deprecation]
+                members: [deprecation_file, deprecation_stderr]
+            deprecation_file:
+                type: stream
+                path: "%kernel.logs_dir%/php/deprecation.log"
+                formatter: monolog.formatter.json
+            deprecation_stderr:
+                type: stream
                 path: php://stderr
                 formatter: monolog.formatter.json