Add health check endpoint and refactor integration response handling

- Introduced a new public health check endpoint at `api/ping/` to verify API responsiveness.
- Refactored integration response handling to utilize a unified success and error response format across various methods in `IntegrationSettingsViewSet`, improving consistency and clarity in API responses.
- Updated URL patterns to include the new ping endpoint and adjusted imports accordingly.

backend/igny8_core/modules/system/views.py

@@ -269,6 +269,24 @@ class StrategyViewSet(AccountModelViewSet):
     filterset_fields = ['is_active', 'sector']
 
 
+@api_view(['GET'])
+@permission_classes([AllowAny])  # Public endpoint
+@extend_schema(
+    tags=['System'],
+    summary='Health Check',
+    description='Simple health check endpoint to verify API is responding'
+)
+def ping(request):
+    """
+    Simple health check endpoint
+    Returns unified format: {success: true, data: {status: 'ok'}}
+    """
+    return success_response(
+        data={'status': 'ok'},
+        request=request
+    )
+
+
 @api_view(['GET'])
 @permission_classes([AllowAny])  # Public endpoint for monitoring
 def system_status(request):