Refactor FuturesBot and SpotBot to utilize ticker enum for candle retrieval

- Updated GetCurrentCandleForPositionClose method in both FuturesBot and SpotBot to parse the ticker parameter into an enum, enhancing type safety and clarity.
- Adjusted TradingBotBase to use the position's ticker for candle retrieval, ensuring consistency across trading bot implementations.

src/Managing.Application/Bots/FuturesBot.cs

@@ -77,8 +77,10 @@ public class FuturesBot : TradingBotBase
     protected override async Task<Candle> GetCurrentCandleForPositionClose(Account account, string ticker)
     {
         // For live trading, get real-time candle from exchange
+        // ticker parameter is a string representation of the position's ticker
+        var tickerEnum = Enum.Parse<Ticker>(ticker);
         return await ServiceScopeHelpers.WithScopedService<IExchangeService, Candle>(_scopeFactory,
-            async exchangeService => await exchangeService.GetCandle(Account, Config.Ticker, DateTime.UtcNow));
+            async exchangeService => await exchangeService.GetCandle(Account, tickerEnum, DateTime.UtcNow));
     }
 
     protected override async Task<bool> CheckBrokerPositions()

src/Managing.Application/Bots/SpotBot.cs

@@ -143,8 +143,10 @@ public class SpotBot : TradingBotBase
     protected override async Task<Candle> GetCurrentCandleForPositionClose(Account account, string ticker)
     {
         // For live trading, get real-time candle from exchange
+        // ticker parameter is a string representation of the position's ticker
+        var tickerEnum = Enum.Parse<Ticker>(ticker);
         return await ServiceScopeHelpers.WithScopedService<IExchangeService, Candle>(_scopeFactory,
-            async exchangeService => await exchangeService.GetCandle(Account, Config.Ticker, DateTime.UtcNow));
+            async exchangeService => await exchangeService.GetCandle(Account, tickerEnum, DateTime.UtcNow));
     }
 
     protected override async Task<bool> CheckBrokerPositions()

src/Managing.Application/Bots/TradingBotBase.cs

@@ -477,7 +477,7 @@ public abstract class TradingBotBase : ITradingBot
                 {
                     lastCandle = TradingBox.IsBacktestTrading(Config.TradingType)
                         ? LastCandle
-                        : await exchangeService.GetCandle(Account, Config.Ticker,
+                        : await exchangeService.GetCandle(Account, positionForSignal.Ticker,
                             DateTime.UtcNow);
                 });
 
@@ -1177,7 +1177,7 @@ public abstract class TradingBotBase : ITradingBot
     {
         if (Positions.ContainsKey(position.Identifier))
         {
-            Candle currentCandle = await GetCurrentCandleForPositionClose(Account, Config.Ticker.ToString());
+            Candle currentCandle = await GetCurrentCandleForPositionClose(Account, position.Ticker.ToString());
 
             // Try broker history reconciliation first
             var brokerHistoryReconciled = await ReconcileWithBrokerHistory(position, currentCandle);