feat: add mtproxy(#2370)

* Feat: Add MtProxy (Telegram)

* add path files

* refactor: move logic from ui to core

---------

Co-authored-by: vkamn <vk@amnezia.org>

client/ui/controllers/networkReachabilityController.h

@@ -0,0 +1,30 @@
+#ifndef NETWORKREACHABILITYCONTROLLER_H
+#define NETWORKREACHABILITYCONTROLLER_H
+
+#include <QObject>
+
+// Exposes QNetworkInformation to QML for UI that must not run remote operations offline.
+// Note: mozilla/networkwatcher.h has NetworkWatcher::getReachability() using the same API,
+// but networkwatcher.cpp is not linked into the desktop client (only the service process).
+
+class NetworkReachabilityController final : public QObject {
+Q_OBJECT
+
+    Q_PROPERTY(bool hasInternetAccess READ hasInternetAccess NOTIFY hasInternetAccessChanged)
+
+public:
+    explicit NetworkReachabilityController(QObject *parent = nullptr);
+
+    bool hasInternetAccess() const;
+
+signals:
+
+    void hasInternetAccessChanged();
+
+private:
+    void attachToNetworkInformation();
+
+    bool m_hasInternetAccess = true;
+};
+
+#endif // NETWORKREACHABILITYCONTROLLER_H