feat: Add session layout

sources/Session/MessageSerializer.hpp

@@ -0,0 +1,20 @@
+// Copyright (C) 2024-2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <QJsonObject>
+
+#include "Message.hpp"
+
+namespace QodeAssist {
+
+class MessageSerializer
+{
+public:
+    static QJsonObject toJson(const Message &message);
+
+    static Message fromJson(const QJsonObject &json, bool *ok = nullptr);
+};
+
+} // namespace QodeAssist