feat: Add CrowdSec configuration management and export functionality

- Implemented CrowdSec configuration page with import/export capabilities.
- Added API endpoints for exporting, importing, listing, reading, and writing CrowdSec configuration files.
- Enhanced security handler to support runtime overrides for CrowdSec mode and API URL.
- Updated frontend components to include CrowdSec settings in the UI.
- Added tests for CrowdSec configuration management and security handler behavior.
- Improved user experience with toast notifications for successful operations and error handling.

frontend/src/components/AccessListForm.tsx

@@ -216,7 +216,7 @@ export function AccessListForm({ initialData, onSubmit, onCancel, onDelete, isLo
           <label htmlFor="type" className="block text-sm font-medium text-gray-300 mb-2">
             Type *
             <a
-              href="https://wikid82.github.io/charon/docs/security.html#acl-best-practices-by-service-type"
+              href="https://wikid82.github.io/charon/security#acl-best-practices-by-service-type"
               target="_blank"
               rel="noopener noreferrer"
               className="ml-2 text-blue-400 hover:text-blue-300 text-xs"

frontend/src/components/AccessListSelector.tsx

@@ -63,7 +63,7 @@ export default function AccessListSelector({ value, onChange }: AccessListSelect
         </a>
         {' • '}
         <a
-          href="https://wikid82.github.io/charon/docs/security.html#acl-best-practices-by-service-type"
+          href="https://wikid82.github.io/charon/security#acl-best-practices-by-service-type"
           target="_blank"
           rel="noopener noreferrer"
           className="text-blue-400 hover:underline inline-flex items-center gap-1"

frontend/src/components/Layout.tsx

@@ -64,6 +64,7 @@ export default function Layout({ children }: LayoutProps) {
       icon: '⚙️',
       children: [
         { name: 'System', path: '/settings/system', icon: '⚙️' },
+        { name: 'CrowdSec', path: '/settings/crowdsec', icon: '🛡️' },
         { name: 'Account', path: '/settings/account', icon: '🛡️' },
       ]
     },