feat: Add category performance, update WebUI and OpenRouter integration, fix bugs

src/Predictalytics.Domain/Entities/TraderCategoryPerformance.cs

@@ -0,0 +1,28 @@
+using Predictalytics.Domain.Enums;
+
+namespace Predictalytics.Domain.Entities;
+
+public class TraderCategoryPerformance
+{
+    public int Id { get; set; }
+    
+    public int TraderId { get; set; }
+    public Trader Trader { get; set; } = null!;
+
+    public MarketCategory Category { get; set; }
+
+    /// <summary>Total volume traded in this category (USD).</summary>
+    public decimal TotalVolume { get; set; }
+
+    /// <summary>Total Profit/Loss in this category (USD).</summary>
+    public decimal TotalPnL { get; set; }
+
+    /// <summary>Number of trades in this category.</summary>
+    public int TotalTrades { get; set; }
+
+    /// <summary>Number of profitable trades in this category.</summary>
+    public int WinningTrades { get; set; }
+
+    /// <summary>Calculated win rate for this category (0.0 - 1.0).</summary>
+    public decimal WinRate => TotalTrades > 0 ? (decimal)WinningTrades / TotalTrades : 0;
+}