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/UpgradePanel.hpp

@@ -134,6 +134,12 @@ protected:
     wxStaticLine* m_extinguish_line_above = nullptr;;
     uiDeviceUpdateVersion* m_extinguish_version = nullptr;
 
+    /* filament track switch info*/
+    wxBoxSizer*            m_filatrack_sizer = nullptr;
+    wxStaticBitmap*        m_filatrack_img = nullptr;
+    wxStaticLine*          m_filatrack_line_above = nullptr;
+    uiDeviceUpdateVersion* m_filatrack_version = nullptr;
+
     /* nozzle rack (H2C induction hotend rack) — opens wgtDeviceNozzleRackUpgradeDlg */
     wxBoxSizer*     m_nozzle_rack_sizer = nullptr;
     wxStaticBitmap* m_nozzle_rack_img = nullptr;
@@ -162,6 +168,7 @@ protected:
     ScalableBitmap m_img_cutting;
     ScalableBitmap m_img_laser;
     ScalableBitmap m_img_extinguish;
+    ScalableBitmap m_img_filatrack;
     ScalableBitmap m_img_nozzle_rack;
     ScalableBitmap upgrade_gray_icon;
     ScalableBitmap upgrade_green_icon;
@@ -220,18 +227,21 @@ private:
     void createCuttingWidgets(wxBoxSizer* main_left_sizer);
     void createLaserWidgets(wxBoxSizer* main_left_sizer);
     void createExtinguishWidgets(wxBoxSizer* main_left_sizer);
+    void createFilaTrackSwitchWidgets(wxBoxSizer* main_left_sizer);
     void createNozzleRackWidgets(wxBoxSizer* main_left_sizer);
 
     void update_air_pump(MachineObject* obj);
     void update_cut(MachineObject* obj);
     void update_laszer(MachineObject* obj);
     void update_extinguish(MachineObject* obj);
+    void update_filatrack(MachineObject* obj);
     void update_nozzle_rack(MachineObject* obj);
 
     void show_air_pump(bool show = true);
     void show_cut(bool show = true);
     void show_laszer(bool show = true);
     void show_extinguish(bool show = true);
+    void show_filatrack(bool show = true);
     void show_nozzle_rack(bool show = true);
 
     void on_nozzle_rack_update(wxCommandEvent& event);