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/tablemodel/tablemodel.cpp

@@ -1,46 +0,0 @@
-// Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
-#include "../connection.h"
-
-#include <QApplication>
-#include <QSqlTableModel>
-#include <QTableView>
-
-void initializeModel(QSqlTableModel *model)
-{
-    model->setTable("person");
-    model->setEditStrategy(QSqlTableModel::OnManualSubmit);
-    model->select();
-
-    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(QSqlTableModel *model, const QString &title = "")
-{
-    QTableView *view = new QTableView;
-    view->setModel(model);
-    view->setWindowTitle(title);
-    return view;
-}
-
-int main(int argc, char *argv[])
-{
-    QApplication app(argc, argv);
-    if (!createConnection())
-        return EXIT_FAILURE;
-
-    QSqlTableModel model;
-
-    initializeModel(&model);
-
-    QTableView *view1 = createView(&model, QObject::tr("Table Model (View 1)"));
-    QTableView *view2 = createView(&model, QObject::tr("Table Model (View 2)"));
-
-    view1->show();
-    view2->move(view1->x() + view1->width() + 20, view1->y());
-    view2->show();
-
-    return app.exec();
-}