Block user to create strategy with over allocation

src/Managing.Application/ManageBot/StartBotCommandHandler.cs

@@ -72,6 +72,14 @@ namespace Managing.Application.ManageBot
                 }
             }
 
+            // Enforce allocation limit across all bots using the same account
+            var availableAllocation = await _botService.GetAvailableAllocationUsdAsync(account, default);
+            if (request.Config.BotTradingBalance > availableAllocation)
+            {
+                throw new InvalidOperationException(
+                    $"Insufficient available allocation on account '{account.Name}'. Requested: {request.Config.BotTradingBalance:F2} USDC, Available: {availableAllocation:F2} USDC.");
+            }
+
             try
             {
                 var botGrain = _grainFactory.GetGrain<ILiveTradingBotGrain>(Guid.NewGuid());