CrealityPrint: add printer model name and detection UI

Add model_name() to map firmware model codes (F008, F012, F021)
to human-readable names (K2 Plus, K2 Pro, K2). Update the send
dialog init() to detect multi-color support and show a group box
with the printer name.

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

src/slic3r/Utils/CrealityPrint.cpp

@@ -1,6 +1,7 @@
 #include "CrealityPrint.hpp"
 
 #include <algorithm>
+#include <map>
 #include <sstream>
 #include <exception>
 #include <boost/format.hpp>
@@ -262,6 +263,20 @@ bool CrealityPrint::supports_multi_color_print() const
         || m_model == "F021";   // K2
 }
 
+std::string CrealityPrint::model_name() const
+{
+    static const std::map<std::string, std::string> names = {
+        {"F008", "K2 Plus"},
+        {"F012", "K2 Pro"},
+        {"F021", "K2"},
+    };
+    query_model();
+    if (m_model.empty())
+        return "unreachable";
+    auto it = names.find(m_model);
+    return it != names.end() ? it->second : "unknown (" + m_model + ")";
+}
+
 std::string CrealityPrint::query_boxes_info() const
 {
     try {

src/slic3r/Utils/CrealityPrint.hpp

@@ -32,6 +32,7 @@ public:
     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;
+    std::string model_name() const;
 
 protected:
     virtual void set_auth(Http& http) const;