Initial commit: Predictalytics solution

Clean Architecture .NET 8 solution (Domain/Application/Infrastructure/Api/Worker/WinFormsHost)
for analyzing Polymarket traders for copytrading/strategy-replication candidates.

Includes EF Core InitialBaseline migration and DB secrets removed from source/config
in preparation for version control.

src/Predictalytics.Domain/Entities/Alert.cs

@@ -0,0 +1,38 @@
+using Predictalytics.Domain.Enums;
+
+namespace Predictalytics.Domain.Entities;
+
+/// <summary>
+/// An alert triggered by the system based on configurable rules.
+/// </summary>
+public class Alert
+{
+    public int Id { get; set; }
+
+    /// <summary>Type of alert.</summary>
+    public AlertType Type { get; set; }
+
+    /// <summary>Platform where the triggering event occurred.</summary>
+    public PlatformType Platform { get; set; }
+
+    /// <summary>Optional reference to the trader who triggered this alert.</summary>
+    public int? TraderId { get; set; }
+
+    /// <summary>Alert title / headline.</summary>
+    public string Title { get; set; } = string.Empty;
+
+    /// <summary>Detailed message describing the alert.</summary>
+    public string Message { get; set; } = string.Empty;
+
+    /// <summary>Severity: 1=Low, 2=Medium, 3=High, 4=Critical.</summary>
+    public int Severity { get; set; } = 1;
+
+    /// <summary>Whether the alert has been read/acknowledged.</summary>
+    public bool IsRead { get; set; }
+
+    /// <summary>When the alert was created.</summary>
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+    // Navigation
+    public Trader? Trader { get; set; }
+}