Refactor fleet module and add cleanup script

- Update Celery configuration in celery.py
- Modify base settings for improved performance
- Enhance task management in fleet tasks.py
- Revise fleet views.py for better data handling
- Add cleanup_tmp_archives.sh script for temporary file management
- Adjust docker-compose.prod.yml for consistency
- Optimize fleetDashboardStore.js with reduced code complexity

backend/scripts/cleanup_tmp_archives.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+set -eu
+
+TARGET_DIR="${TMP_ARCHIVE_DIR:-/tmp/erp-generated-archives}"
+RETENTION_DAYS="${TMP_RETENTION_DAYS:-1}"
+
+if [ ! -d "$TARGET_DIR" ]; then
+  exit 0
+fi
+
+find "$TARGET_DIR" -type f -name '*.zip' -mtime +"$RETENTION_DAYS" -delete
+find "$TARGET_DIR" -type d -empty -delete