Add Bollinger Bands Volatility Protection indicator support

- Introduced BollingerBandsVolatilityProtection indicator in GeneticService with configuration settings for period and standard deviation (stdev).
- Updated ScenarioHelpers to handle creation and validation of the new indicator type.
- Enhanced CustomScenario, backtest, and scenario pages to include BollingerBandsVolatilityProtection in indicator lists and parameter mappings.
- Modified API and types to reflect the addition of the new indicator in relevant enums and mappings.
- Updated frontend components to support new parameters and visualization for Bollinger Bands.

src/Managing.Api/Controllers/BacktestController.cs

@@ -666,6 +666,16 @@ public class BacktestController : BaseController
                 }
             }
 
+            // Normalize SignalType for all indicators based on their IndicatorType
+            // This ensures the correct SignalType is saved regardless of what the frontend sent
+            if (request.UniversalConfig.Scenario?.Indicators != null)
+            {
+                foreach (var indicator in request.UniversalConfig.Scenario.Indicators)
+                {
+                    indicator.SignalType = ScenarioHelpers.GetSignalType(indicator.Type);
+                }
+            }
+
             // Create the bundle backtest request
             var bundleRequest = new BundleBacktestRequest
             {