- Remove CSF menu item from sidebar navigation
- Disable CSF-related URL endpoints in firewall module
- Update upgrade process to automatically remove CSF and restore firewalld
- Archive CSF template and configuration files
- Clean up CSF references in settings and upgrade scripts
CSF (ConfigServer Security & Firewall) is shutting down on August 31, 2025.
This commit removes CSF integration and ensures firewalld is restored as the
default firewall solution during upgrades.
Fixes#1473