feat: add TradeContext, Subcategory and LastAnalyzedAt

src/Predictalytics.Domain/Entities/Trader.cs

@@ -64,6 +64,9 @@ public class Trader
     /// <summary>When the AI strategy summary was last updated.</summary>
     public DateTime? AiStrategyUpdatedAt { get; set; }
 
+    /// <summary>When the TraderAnalyticsWorker last performed a deep dive on this trader.</summary>
+    public DateTime? LastAnalyzedAt { get; set; }
+
     /// <summary>Total number of trades tracked.</summary>
     public int TotalTrades { get; set; }