moved passphraseCallback and passphraseDialog to startPage

- made some methods of the servercontroller class private
- returned a call to the checkSshConnection() function

client/ui/pages_logic/StartPageLogic.h

@@ -23,6 +23,8 @@ class StartPageLogic : public PageLogicBase
     AUTO_PROPERTY(QString, labelWaitInfoText)
     AUTO_PROPERTY(bool, pushButtonBackFromStartVisible)
 
+    AUTO_PROPERTY(QString, privateKeyPassphrase);
+
     READONLY_PROPERTY(QRegularExpression, ipAddressPortRegex)
 public:
     Q_INVOKABLE void onUpdatePage() override;
@@ -47,5 +49,8 @@ public:
     explicit StartPageLogic(UiLogic *uiLogic, QObject *parent = nullptr);
     ~StartPageLogic() = default;
 
+signals:
+    void showPassphraseRequestMessage();
+    void passphraseDialogClosed();
 };
 #endif // START_PAGE_LOGIC_H