refactor: Decoupling chat architecture (#367)

* refactor: Migrate tests to Qt Creator plugin framework and update llmqore transports

* refactor: Move conversation history into IDE-free session library

* refactor: Extract turn context assembly behind injected ports

* build: Add RunQodeAssistTests target for the plugin test suite

* refactor: Route the chat through a Session and ChatBackend seam

sources/session/TurnRequest.hpp

@@ -0,0 +1,33 @@
+// Copyright (C) 2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Additional attribution terms under GPLv3 §7(b) apply — see LICENSE
+
+#pragma once
+
+#include <QList>
+
+#include <optional>
+
+#include "session/ContentBlock.hpp"
+#include "session/ConversationHistory.hpp"
+#include "session/TurnContext.hpp"
+
+namespace QodeAssist::Session {
+
+struct TurnOptions
+{
+    bool useTools = false;
+    bool useThinking = false;
+
+    bool operator==(const TurnOptions &other) const = default;
+};
+
+struct TurnRequest
+{
+    QList<ContentBlock> userBlocks;
+    const ConversationHistory *history = nullptr;
+    std::optional<TurnContext> context;
+    TurnOptions options;
+};
+
+} // namespace QodeAssist::Session