refactor: Restructure project into sources/tests layout and dissolve PluginLLMCore

sources/context/ProjectUtils.hpp

@@ -0,0 +1,51 @@
+// Copyright (C) 2025-2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Additional attribution terms under GPLv3 §7(b) apply — see LICENSE
+
+#pragma once
+
+#include <QString>
+
+namespace QodeAssist::Context {
+
+/**
+ * @brief Utility functions for working with Qt Creator projects
+ */
+class ProjectUtils
+{
+public:
+    /**
+     * @brief Check if a file is part of any open project
+     * 
+     * Checks if the given file path is either:
+     * 1. Explicitly listed in project source files
+     * 2. Located within a project directory
+     * 
+     * @param filePath Absolute or canonical file path to check
+     * @return true if file is part of any open project, false otherwise
+     */
+    static bool isFileInProject(const QString &filePath);
+
+    /**
+     * @brief Find a file in open projects by filename
+     * 
+     * Searches all open projects for a file matching the given filename.
+     * If multiple files with the same name exist, returns the first match.
+     * 
+     * @param filename File name to search for (e.g., "main.cpp")
+     * @return Absolute file path if found, empty string otherwise
+     */
+    static QString findFileInProject(const QString &filename);
+
+    /**
+     * @brief Get the project root directory
+     * 
+     * Returns the root directory of the first open project.
+     * If multiple projects are open, returns the first one.
+     * 
+     * @return Absolute path to project root, or empty string if no project is open
+     */
+    static QString getProjectRoot();
+};
+
+} // namespace QodeAssist::Context