Initial commit: JDE Scoping Tool migration project

Set up repository with legacy .NET Framework 4.8 source (OLD/),
new .NET 10 Blazor solution (NEW/), OpenSpec specifications,
documentation, and project configuration.

NEW/src/JdeScoping.Core/Interfaces/ISearchProcessor.cs

@@ -0,0 +1,17 @@
+namespace JdeScoping.Core.Interfaces;
+
+/// <summary>
+/// Processor for executing user search requests.
+/// </summary>
+public interface ISearchProcessor
+{
+    /// <summary>
+    /// Processes a queued search request.
+    /// </summary>
+    Task ProcessSearchAsync(int searchId, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Gets the next pending search to process.
+    /// </summary>
+    Task<int?> GetNextPendingSearchAsync(CancellationToken cancellationToken = default);
+}