Add BacktestSpotBot and update BacktestExecutor for spot trading support

- Introduced BacktestSpotBot class to handle backtesting for spot trading scenarios.
- Updated BacktestExecutor to support both BacktestFutures and BacktestSpot trading types.
- Enhanced error handling to provide clearer messages for unsupported trading types.
- Registered new command handlers for OpenSpotPositionRequest and CloseSpotPositionCommand in ApiBootstrap.
- Added unit tests for executing backtests with spot trading configurations, ensuring correct behavior and metrics validation.

src/Managing.Application/Backtests/BacktestExecutor.cs

@@ -544,15 +544,22 @@ public class BacktestExecutor
             throw new InvalidOperationException("Bot configuration is not initialized");
         }
 
-        if (config.TradingType != TradingType.BacktestFutures)
+        if (config.TradingType != TradingType.BacktestFutures && config.TradingType != TradingType.BacktestSpot)
         {
-            throw new InvalidOperationException("BacktestExecutor can only be used for backtesting");
+            throw new InvalidOperationException($"BacktestExecutor can only be used for backtesting. TradingType must be BacktestFutures or BacktestSpot, but got {config.TradingType}");
         }
 
-        // Create the trading bot instance
+        // Create the trading bot instance based on TradingType
         using var scope = _scopeFactory.CreateScope();
         var logger = scope.ServiceProvider.GetRequiredService<ILogger<TradingBotBase>>();
-        var tradingBot = new BacktestFuturesBot(logger, _scopeFactory, config);
+        
+        TradingBotBase tradingBot = config.TradingType switch
+        {
+            TradingType.BacktestFutures => new BacktestFuturesBot(logger, _scopeFactory, config),
+            TradingType.BacktestSpot => new BacktestSpotBot(logger, _scopeFactory, config),
+            _ => throw new InvalidOperationException($"Unsupported TradingType for backtest: {config.TradingType}")
+        };
+        
         return tradingBot;
     }