Refactor SpotBot and ExchangeService for balance retrieval

- Updated SpotBot to fetch token balance directly using the new GetBalance method in IExchangeService.
- Modified IExchangeService to include a method for retrieving balance by ticker.
- Enhanced ExchangeService to implement the new balance retrieval logic for both EVM and non-EVM exchanges.
- Updated TokenService to streamline contract address and decimal retrieval for various tokens.
- Adjusted TradesModal to reflect changes in position status handling.

src/Managing.Application/Bots/SpotBot.cs

@@ -85,14 +85,9 @@ public class SpotBot : TradingBotBase, ITradingBot
         // For spot trading, fetch token balance directly and update PnL based on current price
         try
         {
-            var balances = await ServiceScopeHelpers.WithScopedService<IExchangeService, List<Balance>>(
+            var tokenBalance = await ServiceScopeHelpers.WithScopedService<IExchangeService, Balance?>(
                 _scopeFactory,
-                async exchangeService => { return await exchangeService.GetBalances(Account); });
-
-            // Find the token balance for the ticker
-            var tickerString = Config.Ticker.ToString();
-            var tokenBalance = balances.FirstOrDefault(b =>
-                b.TokenName?.Equals(tickerString, StringComparison.OrdinalIgnoreCase) == true);
+                async exchangeService => await exchangeService.GetBalance(Account, Config.Ticker));
 
             if (tokenBalance == null || tokenBalance.Amount <= 0)
             {