chore: initial commit of TaskTracker project

Existing ASP.NET API with vanilla JS SPA, WindowWatcher, Chrome extension, and MCP server.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

TaskTracker.Core/Interfaces/IAppMappingRepository.cs

@@ -0,0 +1,13 @@
+using TaskTracker.Core.Entities;
+
+namespace TaskTracker.Core.Interfaces;
+
+public interface IAppMappingRepository
+{
+    Task<List<AppMapping>> GetAllAsync();
+    Task<AppMapping?> GetByIdAsync(int id);
+    Task<AppMapping> CreateAsync(AppMapping mapping);
+    Task UpdateAsync(AppMapping mapping);
+    Task DeleteAsync(int id);
+    Task<AppMapping?> FindMatchAsync(string appName, string windowTitle, string? url);
+}