Refactor: Reorganize project structure by moving core components into dedicated directories and introducing new configuration and API models.

IO/Notifications.cs

@@ -0,0 +1,25 @@
+using System.Diagnostics;
+
+namespace Toak.IO;
+
+public static class Notifications
+{
+    public static void Notify(string summary, string body = "")
+    {
+        try
+        {
+            var pInfo = new ProcessStartInfo
+            {
+                FileName = "notify-send",
+                Arguments = $"-a \"Toak\" \"{summary}\" \"{body}\"",
+                UseShellExecute = false,
+                CreateNoWindow = true
+            };
+            Process.Start(pInfo);
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"[Notifications] Failed to send notification: {ex.Message}");
+        }
+    }
+}