Enhance Notification and User Models with New Fields and Update Swagger Documentation

- Added 'image' and 'link' fields to the NotificationRequest and NotificationResponse structures, improving the flexibility of notification content.
- Updated the 'created_at', 'updated_at', and 'schedule_at' fields to use integer types for Unix timestamps, ensuring consistency in time handling.
- Expanded the tender status enumeration to include 'closed', 'modified', 'suspended', and 'published', enhancing the representation of tender states.
- Reflected these changes in the Swagger documentation, ensuring accurate API specifications for clients.

internal/notification/handler.go

@@ -50,7 +50,7 @@ func (h *NotificationHandler) Send(c echo.Context) error {
 	}
 
 	// Send notification
-	go h.service.Send(context.Background(), &req)
+	h.service.Send(context.Background(), &req)
 
 	return response.Created(c, nil, "Notification sent successfully")
 }