Block user to create strategy with over allocation

src/Managing.Application/Abstractions/IBotService.cs

@@ -26,6 +26,16 @@ public interface IBotService
     Task<bool> UpdateBotStatisticsAsync(Guid identifier);
     Task<bool> SaveBotStatisticsAsync(Bot bot);
     
+    /// <summary>
+    /// Computes the remaining available USDC allocation for the provided account,
+    /// subtracting the sum of BotTradingBalance from other bots using the same account.
+    /// Optionally exclude a specific bot identifier from the allocation sum (useful for restarts/updates).
+    /// </summary>
+    /// <param name="account">Target account.</param>
+    /// <param name="excludeIdentifier">Bot identifier to exclude from allocation sum.</param>
+    /// <returns>Available USDC amount that can be allocated.</returns>
+    Task<decimal> GetAvailableAllocationUsdAsync(Account account, Guid excludeIdentifier = default);
+    
     /// <summary>
     /// Gets paginated bots with filtering and sorting
     /// </summary>