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.Domain/Indicators/Context/BollingerBandsVolatilityProtection.cs

@@ -0,0 +1,71 @@
+using Managing.Domain.Candles;
+using Managing.Domain.Strategies.Base;
+using Skender.Stock.Indicators;
+using static Managing.Common.Enums;
+
+namespace Managing.Domain.Strategies.Context;
+
+public class BollingerBandsVolatilityProtection : BollingerBandsBase
+{
+    public BollingerBandsVolatilityProtection(string name, int period, double stdev) : base(name, IndicatorType.BollingerBandsVolatilityProtection, period, stdev)
+    {
+    }
+
+    /// <summary>
+    /// Processes Bollinger Bands volatility protection signals based on bandwidth analysis.
+    /// This method applies a veto filter during periods of market extremes:
+    /// - Blocks signals when bandwidth is extremely high (dangerous expansion) or extremely low (dead market)
+    /// - Validates signals when bandwidth is normal to low (excluding squeeze extremes)
+    /// Bandwidth = (UpperBand - LowerBand) / Sma represents market volatility
+    /// </summary>
+    /// <param name="bbResults">List of Bollinger Bands calculation results</param>
+    /// <param name="candles">Candles to process</param>
+    protected override void ProcessBollingerBandsSignals(List<BollingerBandsResult> bbResults, HashSet<Candle> candles)
+    {
+        var bbCandles = MapBollingerBandsToCandle(bbResults, candles.TakeLast(Period.Value)).ToList();
+
+        if (bbCandles.Count == 0)
+            return;
+
+        foreach (var currentCandle in bbCandles)
+        {
+            var width = currentCandle.Width ?? 0;
+
+            // Determine confidence based on width levels (bandwidth as % of SMA)
+            // Lower width = less volatility = higher confidence for trading
+            // Higher width = more volatility = lower confidence for trading
+            Confidence confidence;
+
+            if (width >= 0.15) // Extremely high volatility - dangerous expansion
+            {
+                // Block all signals during dangerous volatility expansion
+                confidence = Confidence.None;
+            }
+            else if (width <= 0.02) // Extremely low volatility - dead market/squeeze
+            {
+                // Block all signals in dead markets or extreme squeezes
+                confidence = Confidence.None;
+            }
+            else if (width <= 0.05) // Low to normal volatility - good for trading
+            {
+                // Validate signals during low volatility trending conditions
+                confidence = Confidence.High;
+            }
+            else if (width <= 0.10) // Normal volatility - acceptable for trading
+            {
+                // Validate signals during normal volatility conditions
+                confidence = Confidence.Medium;
+            }
+            else // Moderate high volatility (0.10 - 0.15)
+            {
+                // Lower confidence during elevated but not extreme volatility
+                confidence = Confidence.Low;
+            }
+
+            // Context strategies always return TradeDirection.None
+            // The confidence level indicates the quality of market conditions
+            AddSignal(currentCandle, TradeDirection.None, confidence);
+        }
+    }
+
+}