fix: KF6Attica recipe, kf6-knewstuff Attica dep, topo-sort cycle error

- Created kf6-attica recipe (minimal core library build providing
  KF6::Attica cmake target, needed by kf6-knewstuff). v6.10.0,
  QML/tests/examples disabled.
- Added kf6-attica to redbear-full.toml config, integrate-redbear.sh
  symlink, and recipes/kde/ symlink.
- Fixed kf6-knewstuff: removed stale find_package(KF6Attica)
  suppression; added kf6-attica as dependency. Now publishes
  to repo (core-only build produces empty package — upstream
  code structure yields no libs with QtQuick/widgets/tools off).
- Cookbook topo-sort: changed cycle fallback from silent
  Ok(recipes) to Err(Recursion) — surfaces dependency graph
  bugs instead of hiding them.
- Fixed stale QtNetwork comment: QtNetwork IS enabled in qtbase
  since 2026-04-29 (relibc DNS resolver hardened).
- Verified: kf6-attica builds, kf6-knewstuff publishes to repo

local/recipes/kde/kf6-attica/source/src/remoteaccount.h

@@ -0,0 +1,67 @@
+/*
+    This file is part of KDE.
+
+    SPDX-FileCopyrightText: 2010 Sebastian Kügler <sebas@kde.org>
+
+    SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
+*/
+
+#ifndef ATTICA_REMOTEACCOUNT_H
+#define ATTICA_REMOTEACCOUNT_H
+
+#include <QDate>
+#include <QList>
+#include <QMap>
+#include <QSharedDataPointer>
+#include <QStringList>
+#include <QUrl>
+
+#include "attica_export.h"
+
+namespace Attica
+{
+
+/**
+ * @class RemoteAccount remoteaccount.h <Attica/RemoteAccount>
+ *
+ * Represents a remote account.
+ */
+class ATTICA_EXPORT RemoteAccount
+{
+public:
+    typedef QList<RemoteAccount> List;
+    class Parser;
+
+    RemoteAccount();
+    RemoteAccount(const RemoteAccount &other);
+    RemoteAccount &operator=(const RemoteAccount &other);
+    ~RemoteAccount();
+
+    void setId(const QString &);
+    QString id() const;
+
+    void setType(const QString &);
+    QString type() const;
+
+    void setRemoteServiceId(const QString &);
+    QString remoteServiceId() const;
+
+    void setData(const QString &);
+    QString data() const;
+
+    void setLogin(const QString &);
+    QString login() const;
+
+    void setPassword(const QString &);
+    QString password() const;
+
+    bool isValid() const;
+
+private:
+    class Private;
+    QSharedDataPointer<Private> d;
+};
+
+}
+
+#endif