feat: Add CrowdSec management endpoints and feature flags handler

- Implemented CrowdSec process management with start, stop, and status endpoints.
- Added import functionality for CrowdSec configuration files with backup support.
- Introduced a new FeatureFlagsHandler to manage feature flags with database and environment variable fallback.
- Created tests for CrowdSec handler and feature flags handler.
- Updated routes to include new feature flags and CrowdSec management endpoints.
- Enhanced import handler with better error logging and diagnostics.
- Added frontend API calls for CrowdSec management and feature flags.
- Updated SystemSettings page to manage feature flags and CrowdSec controls.
- Refactored logs and other components for improved functionality and UI consistency.

frontend/src/components/ImportSitesModal.tsx

@@ -30,7 +30,7 @@ export default function ImportSitesModal({ visible, onClose, onUploaded }: Props
       const cleaned = sites.map(s => s || '')
       await uploadCaddyfilesMulti(cleaned)
       setLoading(false)
-      onUploaded && onUploaded()
+      if (onUploaded) onUploaded()
       onClose()
     } catch (err: any) {
       setError(err?.message || 'Upload failed')