Add cancellation token support to backtest execution and update progress handling

src/Managing.Application/Backtests/BacktestExecutor.cs

@@ -125,6 +125,7 @@ public class BacktestExecutor
     /// <param name="bundleRequestId">Optional bundle request ID to update with backtest result</param>
     /// <param name="metadata">Additional metadata</param>
     /// <param name="progressCallback">Optional callback for progress updates (0-100)</param>
+    /// <param name="cancellationToken">Cancellation token to stop execution</param>
     /// <returns>The lightweight backtest result</returns>
     public async Task<LightBacktest> ExecuteAsync(
         TradingBotConfig config,
@@ -135,7 +136,8 @@ public class BacktestExecutor
         string requestId = null,
         Guid? bundleRequestId = null,
         object metadata = null,
-        Func<int, Task> progressCallback = null)
+        Func<int, Task> progressCallback = null,
+        CancellationToken cancellationToken = default)
     {
         if (candles == null || candles.Count == 0)
         {
@@ -247,6 +249,9 @@ public class BacktestExecutor
         // Process all candles with optimized rolling window approach
         foreach (var candle in orderedCandles)
         {
+            // Check for cancellation (timeout or shutdown)
+            cancellationToken.ThrowIfCancellationRequested();
+
             // Add to HashSet for reuse
             fixedCandles.Add(candle);
             tradingBot.LastCandle = candle;