feat: Filament Track Switch (H2-series O2L-FTS) support

The Filament Track Switch (H2-series accessory, product code O2L-FTS) feeds
every AMS to both extruders through a two-track switch. Port full support
across the device layer, project config, and GUI.

Device / config:
- Model the switch-aware AMS binding (the set of extruders an AMS can feed
  and which input track A/B feeds it), switch readiness, the O2L-FTS firmware
  module, and the fun2 capability bit for checking a slice against installed
  hardware.
- Register has_filament_switcher and enable_filament_dynamic_map as project
  config that persists with the project and restores from a saved 3mf, and
  force both back to false on every project/printer/CLI load path. Live
  device sync is the only thing that sets them true.

GUI:
- Sidebar sync activates the switch from live device state, attributes each
  AMS to the extruder its input track feeds, shows a floating status icon
  (ready / not-calibrated), and surfaces a one-time tip / not-calibrated
  warning.
- Send dialog gains a non-blocking slice-vs-hardware mismatch warning and a
  blocking error when a slice needs dynamic nozzle mapping but the switch is
  missing or not set up.
- AMS load/unload guards, AMS-view routing glyph + un-calibrated banner +
  hidden external-spool road, and mapping-popup external-spool lockout.
- Filament pickers collapse the per-extruder split into a single deduplicated
  "AMS filaments" group with a smart-assign toggle when the switch is ready.
- Firmware-upgrade panel lists the O2L-FTS accessory and its version.
- Device-provided filament-change steps (ams.cfs) drive the change-step
  display when firmware sends them, including the three switch steps.
- "Load current filament" asks which extruder to feed via a
  FeedDirectionDialog when the switch is calibrated.

Inert without the accessory: every path is gated on the switch being
installed (MQTT aux bit 29, default off) or ready, both project flags default
false, and the per-extruder AMS attribution is byte-identical, so AMS state,
the send/load UI, and sliced g-code are unchanged for every printer that does
not report a Filament Track Switch.

src/slic3r/GUI/DeviceManager.hpp

@@ -8,6 +8,7 @@
 #include <memory>
 #include <chrono>
 #include <unordered_set>
+#include <optional>
 #include <boost/thread.hpp>
 #include <boost/nowide/fstream.hpp>
 #include "nlohmann/json.hpp"
@@ -378,6 +379,7 @@ public:
     DevFirmwareVersionInfo laser_version_info;
     DevFirmwareVersionInfo cutting_module_version_info;
     DevFirmwareVersionInfo extinguish_version_info;
+    DevFirmwareVersionInfo filatrack_version_info;
     std::map<std::string, DevFirmwareVersionInfo> module_vers;
     std::map<std::string, DevFirmwareVersionInfo> new_ver_list;
     bool    m_new_ver_list_exist = false;
@@ -633,6 +635,7 @@ public:
 
     // fun2
     bool is_support_print_with_emmc{false};
+    bool is_support_check_track_switch_match_slice_printer{false};
 
     bool installed_upgrade_kit{false};
     int  bed_temperature_limit = -1;
@@ -746,7 +749,7 @@ public:
     int check_resume_condition();
     // ams controls
     //int command_ams_switch(int tray_index, int old_temp = 210, int new_temp = 210);
-    int command_ams_change_filament(bool load, std::string ams_id, std::string slot_id, int old_temp = 210, int new_temp = 210);
+    int command_ams_change_filament(bool load, std::string ams_id, std::string slot_id, int old_temp = 210, int new_temp = 210, std::optional<int> extruder_id = std::nullopt);
     int command_ams_user_settings(bool start_read_opt, bool tray_read_opt, bool remain_flag = false);
     int command_ams_switch_filament(bool switch_filament);
     int command_ams_air_print_detect(bool air_print_detect);