Balance for bot (#20)

* Add bot balance

* Update amount to trade

* fix initial trading balance

* Update MM modal

* fix backtest

* stop bot if no more balance

* Add constant for minimum trading

* Add constant

src/Managing.Application/Workflows/Flows/Trading/OpenPosition.cs

@@ -147,10 +147,9 @@ public class OpenPosition : FlowBase
                     PositionInitiator.Bot,
                     signal.Date,
                     account.User,
+                    100m, // Default bot trading balance
                     OpenPositionParameters.IsForBacktest,
-                    lastPrice,
-                    balance: WalletBalances.LastOrDefault().Value,
-                    fee: Fee);
+                    lastPrice);
 
                 var position = await new OpenPositionCommandHandler(_exchangeService, _accountService, _tradingService)
                     .Handle(command);