feat: Add agent roles (#287)

* feat: Add agent roles
* doc: Add agent roles to docs

settings/AgentRoleDialog.hpp

@@ -0,0 +1,55 @@
+/* 
+ * Copyright (C) 2024-2025 Petr Mironychev
+ *
+ * This file is part of QodeAssist.
+ *
+ * QodeAssist is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * QodeAssist is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with QodeAssist. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <QDialog>
+
+#include "AgentRole.hpp"
+
+class QLineEdit;
+class QTextEdit;
+class QDialogButtonBox;
+
+namespace QodeAssist::Settings {
+
+class AgentRoleDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit AgentRoleDialog(QWidget *parent = nullptr);
+    explicit AgentRoleDialog(const AgentRole &role, bool editMode = true, QWidget *parent = nullptr);
+
+    AgentRole getRole() const;
+    void setRole(const AgentRole &role);
+
+private:
+    void setupUI();
+    void validateInput();
+
+    QLineEdit *m_nameEdit = nullptr;
+    QLineEdit *m_idEdit = nullptr;
+    QTextEdit *m_descriptionEdit = nullptr;
+    QTextEdit *m_systemPromptEdit = nullptr;
+    QDialogButtonBox *m_buttonBox = nullptr;
+    bool m_editMode = false;
+};
+
+} // namespace QodeAssist::Settings