fix: repair build — restore signing keys, clean corrupted git-tracked source

- Removed broken netinet/in6_pktinfo_compat.h include from git tracking
- Restored pkgar signing keys from local/cache/keys/
- Restored 100 pkgars from packages/ backup with matching keys
- Mini ISO builds successfully (1.5 GB)
- Full ISO needs COOKBOOK_OFFLINE=false for missing tarballs

local/recipes/qt/qtbase/source/examples/sql/querymodel/main.cpp

@@ -1,52 +0,0 @@
-// Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
-
-#include "../connection.h"
-#include "customsqlmodel.h"
-#include "editablesqlmodel.h"
-
-#include <QApplication>
-#include <QTableView>
-
-void initializeModel(QSqlQueryModel *model)
-{
-    model->setQuery("select * from person");
-    model->setHeaderData(0, Qt::Horizontal, QObject::tr("ID"));
-    model->setHeaderData(1, Qt::Horizontal, QObject::tr("First name"));
-    model->setHeaderData(2, Qt::Horizontal, QObject::tr("Last name"));
-}
-
-QTableView* createView(QSqlQueryModel *model, const QString &title = "")
-{
-    QTableView *view = new QTableView;
-    view->setModel(model);
-    static int offset = 0;
-
-    view->setWindowTitle(title);
-    view->move(100 + offset, 100 + offset);
-    offset += 20;
-    view->show();
-
-    return view;
-}
-
-int main(int argc, char *argv[])
-{
-    QApplication app(argc, argv);
-    if (!createConnection())
-        return EXIT_FAILURE;
-
-    QSqlQueryModel plainModel;
-    EditableSqlModel editableModel;
-    CustomSqlModel customModel;
-
-    initializeModel(&plainModel);
-    initializeModel(&editableModel);
-    initializeModel(&customModel);
-
-    createView(&plainModel, QObject::tr("Plain Query Model"));
-    createView(&editableModel, QObject::tr("Editable Query Model"));
-    createView(&customModel, QObject::tr("Custom Query Model"));
-
-    return app.exec();
-}