feat: Add session layout

sources/Session/SystemPromptBuilder.hpp

@@ -0,0 +1,36 @@
+// Copyright (C) 2024-2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <QObject>
+#include <QString>
+#include <QStringList>
+#include <QVector>
+
+namespace QodeAssist {
+
+class SystemPromptBuilder : public QObject
+{
+    Q_OBJECT
+public:
+    explicit SystemPromptBuilder(QObject *parent = nullptr);
+
+    void setLayer(const QString &name, const QString &text);
+    void clearLayer(const QString &name);
+    void clear();
+
+    QString layer(const QString &name) const;
+    QStringList layerNames() const;
+    bool isEmpty() const { return m_layers.isEmpty(); }
+
+    QString compose(const QString &separator = QStringLiteral("\n\n")) const;
+
+signals:
+    void layersChanged();
+
+private:
+    QVector<QPair<QString, QString>> m_layers;
+};
+
+} // namespace QodeAssist