Support file uploads and the device details page for Elegoo Centauri Carbon 2 (#13212)

* Support file uploads and the device details page for CC2 printers.

* Resolved build issues for Linux and macOS.

* 1. Added `ElegooPrinterWebViewHandler` to handle WebUI messages for Elegoo printers. Other printers will keep the current behavior.
2. Added a static `get_print_host_webui` method in `PrintHost` to retrieve the printer WebUI URL.

* Improved timeout handling for CC2 file upload and SN info APIs.

---------

Co-authored-by: SoftFever <softfeverever@gmail.com>

src/slic3r/GUI/PrinterWebView.hpp

@@ -25,11 +25,14 @@
 #include <wx/tbarbase.h>
 #include "wx/textctrl.h"
 #include <wx/timer.h>
+#include <memory>
 
 
 namespace Slic3r {
 namespace GUI {
 
+class PrinterWebViewHandler;
+
 
 class PrinterWebView : public wxPanel {
 public:
@@ -41,20 +44,24 @@ public:
     void OnClose(wxCloseEvent& evt);
     void OnError(wxWebViewEvent& evt);
     void OnLoaded(wxWebViewEvent& evt);
+    void OnNewWindow(wxWebViewEvent& evt);
+    void OnScriptMessage(wxWebViewEvent& evt);
     void reload();
     void update_mode();
 
     bool Show(bool show = true) override;
 
 private:
+    friend class PrinterWebViewHandler;
+
     void SendAPIKey();
 
     wxWebView* m_browser;
     long m_zoomFactor;
     wxString m_apikey;
     bool m_apikey_sent;
-
     wxString m_url_deferred;
+    std::unique_ptr<PrinterWebViewHandler> m_handler;
 
     // DECLARE_EVENT_TABLE()
 };