- Implemented `exportFirewallRules` method in `FirewallManager` to export custom firewall rules to a JSON file, excluding default rules.
- Added `importFirewallRules` method to handle the import of firewall rules from a JSON file, with validation and error handling.
- Updated `urls.py` to include routes for exporting and importing firewall rules.
- Created corresponding view functions in `views.py` to manage requests for exporting and importing rules.
- Enhanced the frontend with buttons for exporting and importing rules, along with appropriate loading and error handling in `firewall.js`.
- Updated the HTML template to include export/import buttons and loading indicators for better user experience.
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