Add periodic cleanup of orphaned drafts: cleanup job, just command, deploy cron

deploy/xamxam-cleanup.cron

@@ -0,0 +1,7 @@
+# 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.
+# 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