Add SnapmakerPrinterAgent with filament sync support

Introduce SnapmakerPrinterAgent as a MoonrakerPrinterAgent subclass
that handles Snapmaker UI -specific filament detection

src/slic3r/Utils/SnapmakerPrinterAgent.hpp

@@ -0,0 +1,25 @@
+#pragma once
+
+#include "MoonrakerPrinterAgent.hpp"
+
+#include <string>
+
+namespace Slic3r {
+
+class SnapmakerPrinterAgent final : public MoonrakerPrinterAgent
+{
+public:
+    explicit SnapmakerPrinterAgent(std::string log_dir);
+    ~SnapmakerPrinterAgent() override = default;
+
+    static AgentInfo get_agent_info_static();
+    AgentInfo        get_agent_info() override { return get_agent_info_static(); }
+
+    bool fetch_filament_info(std::string dev_id) override;
+
+private:
+    // Combine filament_type + filament_sub_type into a unified type string
+    static std::string combine_filament_type(const std::string& type, const std::string& sub_type);
+};
+
+} // namespace Slic3r