CrealityPrint: add CFS material box query

Add query_boxes_info() to discover loaded materials in the CFS
(Creality Filament System) via websocket. Returns the boxsInfo
JSON with slot details (type, color, vendor, temperature range).

Signed-off-by: Igor Mammedov <niallain@gmail.com>

src/slic3r/Utils/CrealityPrint.cpp

@@ -261,6 +261,23 @@ bool CrealityPrint::supports_multi_color_print() const
         || m_model == "F021";   // K2
 }
 
+std::string CrealityPrint::query_boxes_info() const
+{
+    try {
+        net::io_context ioc;
+        websocket::stream<beast::tcp_stream> ws{ioc};
+        ws_connect(ioc, ws, m_host, "9999");
+
+        json boxs_query = {{"method", "get"}, {"params", {{"boxsInfo", 1}}}};
+        std::string result = ws_send_and_read(ws, boxs_query, "boxsInfo");
+        ws.close(websocket::close_code::normal);
+        return result;
+    } catch (std::exception const& e) {
+        BOOST_LOG_TRIVIAL(error) << "CrealityPrint: Failed to query boxsInfo: " << e.what();
+        return {};
+    }
+}
+
 bool CrealityPrint::start_print(wxString &msg, const std::string &filename) const
 {
     try {

src/slic3r/Utils/CrealityPrint.hpp

@@ -30,6 +30,7 @@ public:
     PrintHostPostUploadActions         get_post_upload_actions() const;
     bool upload(PrintHostUpload upload_data, ProgressFn prorgess_fn, ErrorFn error_fn, InfoFn info_fn) const override;
     bool supports_multi_color_print() const;
+    std::string query_boxes_info() const;
 
 protected:
     virtual void set_auth(Http& http) const;