Enhance DataController and BotService with new configuration and bot name checks

- Added IConfiguration dependency to DataController for environment variable access.
- Updated GetPaginatedAgentSummariesCommand to include a flag for filtering profitable agents.
- Implemented HasUserBotWithNameAsync method in IBotService and BotService to check for existing bots by name.
- Modified StartBotCommandHandler and StartCopyTradingCommandHandler to prevent duplicate bot names during strategy creation.

src/Managing.Application/ManageBot/StartBotCommandHandler.cs

@@ -54,6 +54,15 @@ namespace Managing.Application.ManageBot
                     "You cannot create multiple strategies on the same ticker.");
             }
 
+            // Check if user already has a bot with this name
+            var hasExistingBotWithName = await _botService.HasUserBotWithNameAsync(request.User.Id, request.Config.Name);
+            if (hasExistingBotWithName)
+            {
+                throw new InvalidOperationException(
+                    $"You already have a strategy running or saved with the name '{request.Config.Name}'. " +
+                    "You cannot create multiple strategies with the same name.");
+            }
+
             Account account;
             if (string.IsNullOrEmpty(request.Config.AccountName))
             {