docs(docker): Add /var space issue documentation and monitoring scripts

backend/scripts/check-disk-space.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+# Monitor disk space on all filesystems
+# Run this periodically to catch space issues early
+
+echo "================================"
+echo "Disk Space Check - $(date)"
+echo "================================"
+echo ""
+
+# Check all filesystems
+echo "All Filesystems:"
+df -h
+echo ""
+
+# Check specifically /var
+echo "/var Filesystem:"
+df -h /var 2>/dev/null || echo "No separate /var filesystem"
+echo ""
+
+# Check Docker data location
+echo "Docker Data Location:"
+docker system info 2>/dev/null | grep "Docker Root Dir" || echo "Docker not accessible"
+echo ""
+
+# Check Docker space usage
+echo "Docker Space Usage:"
+docker system df 2>/dev/null || echo "Cannot get Docker stats"
+echo ""
+
+# Alert if any filesystem is > 90% full
+echo "Alerts (filesystems > 90% full):"
+df -h | awk 'NR>1 {gsub(/%/,""); if($5 > 90) print $6 " is " $5 "% full"}"
+if [ $(df -h | awk 'NR>1 {gsub(/%/,""); if($5 > 90)}' | wc -l) -eq 0 ]; then
+  echo "  No alerts"
+fi
+echo ""
+
+echo "================================"
+echo "Check complete"
+echo "================================"