feat: implement SignalR notifications for project status changes

ServiceHost/Notifications/ProgramManager/SignalRBoardNotificationPublisher.cs

@@ -0,0 +1,30 @@
+using GozareshgirProgramManager.Application.Interfaces;
+using GozareshgirProgramManager.Domain.ProjectAgg.Enums;
+using Microsoft.AspNetCore.SignalR;
+using ServiceHost.Hubs.ProgramManager;
+
+namespace ServiceHost.Notifications.ProgramManager;
+
+public class SignalRBoardNotificationPublisher:IBoardNotificationPublisher
+{
+    private readonly IHubContext<ProjectBoardHub> _hubContext;
+
+    public SignalRBoardNotificationPublisher(IHubContext<ProjectBoardHub> hubContext)
+    {
+        _hubContext = hubContext;
+    }
+
+    public Task SendProjectStatusChanged(long userId, TaskSectionStatus oldStatus, 
+        TaskSectionStatus newStatus, Guid sectionId)
+    {
+        var payload = new
+        {
+            UserId = userId,
+            OldStatus = oldStatus,
+            NewStatus = newStatus,
+            SectionId = sectionId
+        };
+        _hubContext.Clients.User(userId.ToString()).SendAsync("ReceiveProjectStatusChanged",payload);
+        return Task.CompletedTask;
+    }
+}