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.Infrastructure/Logging/PlatformLogContext.cs

@@ -0,0 +1,19 @@
+using Serilog.Context;
+
+namespace Predictalytics.Infrastructure.Logging;
+
+/// <summary>
+/// Helper to push platform context into Serilog LogContext for platform-filtered file sinks.
+/// Usage: using (PlatformLogContext.Push("Polymarket")) { ... }
+/// </summary>
+public static class PlatformLogContext
+{
+    /// <summary>
+    /// Pushes the platform name to the Serilog LogContext.
+    /// Dispose the returned IDisposable to remove it.
+    /// </summary>
+    public static IDisposable Push(string platformName)
+    {
+        return LogContext.PushProperty("Platform", platformName);
+    }
+}