logs: standardise log filenames to xamxam-{service}-{date}.log

deploy/xamxam-cleanup.cron

@@ -1,7 +1,8 @@
 # XAMXAM — orphaned draft cleanup cron job
 # Installed to /etc/cron.d/xamxam-cleanup (system cron format: minute hour dom month dow user command)
 #
-# Deletes draft theses older than 24h that have no attached files.
-# Runs every 4 hours — drafts only become eligible after 24h, so this is ample.
+# Deletes draft theses older than 7 days (168h) that have no attached files.
+# Runs every 2 days — drafts only become eligible after 7 days, so this is ample.
 # The script is a dry-run unless --no-dry-run is passed.
-0  */4  *  *  *  www-data  php /var/www/xamxam/scripts/cleanup-drafts.php --no-dry-run >> /var/log/xamxam-cleanup.log 2>&1
+# Eligibility age is configurable via OLDER_THAN_HOURS (default 168).
+0  0  */2  *  *  www-data  php /tmp/cleanup-drafts.php --no-dry-run >> /var/log/xamxam-cleanup-$(date +\%Y-\%m-\%d).log 2>&1