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/customsqlmodel.cpp

@@ -1,27 +0,0 @@
-// Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
-
-#include "customsqlmodel.h"
-
-#include <QColor>
-
-CustomSqlModel::CustomSqlModel(QObject *parent)
-    : QSqlQueryModel(parent)
-{
-}
-
-//! [0]
-QVariant CustomSqlModel::data(const QModelIndex &index, int role) const
-{
-    QVariant value = QSqlQueryModel::data(index, role);
-    if (value.isValid() && role == Qt::DisplayRole) {
-        if (index.column() == 0)
-            return value.toString().prepend('#');
-        else if (index.column() == 2)
-            return value.toString().toUpper();
-    }
-    if (role == Qt::ForegroundRole && index.column() == 1)
-        return QVariant::fromValue(QColor(Qt::blue));
-    return value;
-}
-//! [0]