feat(Database) Adding entity dialog

Services/Website/EntityDialogService.cs

@@ -0,0 +1,49 @@
+using Model.Immortal.Entity;
+
+namespace Services.Website;
+
+public class EntityDialogService : IEntityDialogService
+{
+    private string? entityId = null;
+    
+    private event Action _onChange;
+
+    private void NotifyDataChanged() {
+        _onChange?.Invoke();
+    }
+    
+    public void Subscribe(Action action) {
+        _onChange += action;
+    }
+
+    public void Unsubscribe(Action action) {
+        _onChange += action;
+    }
+    
+    public void AddDialog(string id)
+    {
+        entityId = id;
+
+        NotifyDataChanged();
+    }
+
+    public void CloseDialog()
+    {
+        entityId = null;
+        
+        NotifyDataChanged();
+    }
+    
+
+    public bool HasDialog()
+    {
+        return entityId != null;
+    }
+
+    public string? GetEntityId()
+    {
+        return entityId;
+    }
+}
+
+