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.

PrintService/Services/IpcService.cs

@@ -122,6 +122,17 @@ public class IpcService : IDisposable
                 _logger.LogDebug("Received IPC message: {Message}", message);
             }
 
+            // Try to determine command type
+            var commandType = DetermineCommandType(message);
+            
+            if (commandType == "GetQueueStatus")
+            {
+                var status = GetQueueStatus();
+                await SendQueueStatusResponse(pipeServer, status);
+                return;
+            }
+
+            // Handle print command
             var command = JsonSerializer.Deserialize<PrintCommand>(message);
             if (command == null)
             {
@@ -163,6 +174,70 @@ public class IpcService : IDisposable
         }
     }
 
+    /// <summary>
+    /// Determine the type of command from JSON message
+    /// </summary>
+    private string? DetermineCommandType(string message)
+    {
+        try
+        {
+            using var doc = JsonDocument.Parse(message);
+            if (doc.RootElement.TryGetProperty("Command", out var cmdProp))
+            {
+                return cmdProp.GetString();
+            }
+        }
+        catch { }
+        return null;
+    }
+
+    /// <summary>
+    /// Get current queue status
+    /// </summary>
+    private QueueStatusResponse GetQueueStatus()
+    {
+        try
+        {
+            var jobs = _queueService.GetAllJobs();
+            var jobStatuses = jobs.Select(j => new JobStatus
+            {
+                Id = j.Id.ToString(),
+                FileName = j.OriginalFilename,
+                DocumentType = j.DocumentType,
+                Status = j.Status.ToString(),
+                PrinterName = null, // Will be set when processing starts
+                CurrentPage = null,
+                TotalPages = null
+            }).ToList();
+
+            return new QueueStatusResponse
+            {
+                Success = true,
+                Jobs = jobStatuses
+            };
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Failed to get queue status");
+            return new QueueStatusResponse
+            {
+                Success = false,
+                Message = $"Error: {ex.Message}"
+            };
+        }
+    }
+
+    /// <summary>
+    /// Send queue status response
+    /// </summary>
+    private async Task SendQueueStatusResponse(NamedPipeServerStream pipeServer, QueueStatusResponse response)
+    {
+        var json = JsonSerializer.Serialize(response);
+        var bytes = Encoding.UTF8.GetBytes(json);
+        await pipeServer.WriteAsync(bytes, 0, bytes.Length);
+        await pipeServer.FlushAsync();
+    }
+
     /// <summary>
     /// Process a print command
     /// </summary>
@@ -239,3 +314,27 @@ public class PrintResponse
     public bool Success { get; set; }
     public string Message { get; set; } = string.Empty;
 }
+
+/// <summary>
+/// Queue status response for tray app
+/// </summary>
+public class QueueStatusResponse
+{
+    public bool Success { get; set; }
+    public string? Message { get; set; }
+    public List<JobStatus> Jobs { get; set; } = new();
+}
+
+/// <summary>
+/// Status of a single job
+/// </summary>
+public class JobStatus
+{
+    public string Id { get; set; } = string.Empty;
+    public string FileName { get; set; } = string.Empty;
+    public string DocumentType { get; set; } = string.Empty;
+    public string Status { get; set; } = string.Empty;
+    public string? PrinterName { get; set; }
+    public int? CurrentPage { get; set; }
+    public int? TotalPages { get; set; }
+}