feat: Add Print Service Tray application with configuration and queue management

- Implemented PrintQueueService with job counting and snapshot retrieval.
- Created Form1 as the main entry point for the tray application.
- Developed ConfigurationForm for managing printer configurations and document types.
- Added models for printer configuration, queue status requests, and responses.
- Established ConfigurationService for loading and saving printer configurations.
- Introduced ServiceClient for IPC communication with the print service.
- Built TrayApplicationContext for managing the system tray icon and status updates.
- Added TODO.md for tracking remaining work and future enhancements.

PrintServiceTray/Program.cs

@@ -0,0 +1,35 @@
+namespace PrintServiceTray;
+
+static class Program
+{
+    /// <summary>
+    ///  The main entry point for the application.
+    /// </summary>
+    [STAThread]
+    static void Main()
+    {
+        try
+        {
+            // Prevent multiple instances
+            bool createdNew;
+            using var mutex = new Mutex(true, "LAAPC_PrintServiceTray_Mutex", out createdNew);
+            
+            if (!createdNew)
+            {
+                MessageBox.Show("LAAPC Print Service Tray is already running.", "Already Running", 
+                    MessageBoxButtons.OK, MessageBoxIcon.Information);
+                return;
+            }
+
+            ApplicationConfiguration.Initialize();
+            Application.Run(new TrayApplicationContext());
+            
+            GC.KeepAlive(mutex);
+        }
+        catch (Exception ex)
+        {
+            MessageBox.Show($"Fatal error: {ex.Message}\n\n{ex.StackTrace}", "Error", 
+                MessageBoxButtons.OK, MessageBoxIcon.Error);
+        }
+    }    
+}