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/DeviceCore/DevFilaSystem.h

@@ -4,9 +4,12 @@
 
 #include "DevDefs.h"
 #include "DevFilaAmsSetting.h"
+#include "DevFilaSwitch.h"
 #include "DevUtil.h"
 
 #include <map>
+#include <set>
+#include <vector>
 #include <optional>
 #include <memory>
 #include <wx/string.h>
@@ -169,6 +172,20 @@ public:
     // installed on the extruder
     int   GetExtruderId() const { return m_ext_id; }
 
+    // Extruders this AMS can currently feed. Without a Filament Track Switch installed this
+    // is the single {m_ext_id}; with the switch installed the device binds it to both extruders.
+    const std::set<int>& GetBindedExtruderSet() const { return m_binded_extruder_set; }
+
+    // The bound extruder when exactly one is bound, empty otherwise. Used to attribute an AMS
+    // to a single extruder on printers without the switch.
+    std::optional<int> GetUniqueBindedExtruderId() const
+    {
+        return m_binded_extruder_set.size() == 1 ? std::optional<int>(*m_binded_extruder_set.begin()) : std::nullopt;
+    }
+
+    // Which switch input track (A/B) feeds this AMS, set only when a Filament Track Switch is installed.
+    std::optional<DevFilaSwitch::SwitchPos> GetSwitcherPos() const { return m_binded_switcher_pos; }
+
     // temperature and humidity
     float GetCurrentTemperature() const { return m_current_temperature; }
 
@@ -185,6 +202,12 @@ private:
     AmsType       m_ams_type = AmsType::AMS;
     std::string   m_ams_id;
     int           m_ext_id;//extruder id
+    // Orca: keeps the legacy single m_ext_id for existing consumers and carries the
+    // switch-aware binding alongside it (BambuStudio stores only the set). Without a Filament
+    // Track Switch the set is {m_ext_id}; with one installed the device binds both extruders and
+    // records which input track (A/B) feeds this AMS.
+    std::set<int> m_binded_extruder_set;
+    std::optional<DevFilaSwitch::SwitchPos> m_binded_switcher_pos;
     bool          m_exist = false;
 
     // slots and trays
@@ -268,6 +291,11 @@ public:
 
     std::weak_ptr<DevAmsSystemFirmwareSwitch> GetAmsFirmwareSwitch() const { return m_ams_firmware_switch;}
 
+    // filament change steps
+    // The exact change-step sequence reported by the AMS (ams.cfs). Empty on current firmware,
+    // which leaves the legacy hardcoded/ams_status_sub step handling in effect.
+    const std::vector<DevFilamentStep>& GetFilamentChangeSteps() const { return m_filament_change_steps; }
+
 public:
     // ctrls
     int  CtrlAmsReset() const;
@@ -281,6 +309,9 @@ private:
     /* ams properties */
     int  m_ams_cali_stat = 0;
 
+    // Change-step sequence reported by the AMS (ams.cfs); empty when firmware doesn't send it.
+    std::vector<DevFilamentStep> m_filament_change_steps;
+
     std::map<std::string, DevAms*, NumericStrCompare> amsList;// key: ams[id], start with 0
 
     DevAmsSystemSetting m_ams_system_setting{ this };