Add MasterAgentName to UserStrategyDetailsViewModel and DataController

- Updated UserStrategyDetailsViewModel to include MasterAgentName property, which represents the agent name of the master bot's owner for copy trading bots.
- Modified DataController to populate the MasterAgentName field when returning strategy details.

src/Managing.Api/Controllers/DataController.cs

@@ -609,7 +609,8 @@ public class DataController : ControllerBase
             Positions = positionViewModels,
             Identifier = strategy.Identifier,
             WalletBalances = walletBalances,
-            Ticker = strategy.Ticker
+            Ticker = strategy.Ticker,
+            MasterAgentName = strategy.MasterBotUser?.AgentName
         };
     }