Add 2-Opt TSP solver

This update introduces a new C++ 2-Opt TSP solver with Python bindings.

src/Mod/CAM/App/CMakeLists.txt:
- Add build and install rules for the new pybind11-based tsp_solver Python module

src/Mod/CAM/App/tsp_solver.cpp:
- Add new C++ implementation of a 2-Opt TSP solver with nearest-neighbor initialization

src/Mod/CAM/App/tsp_solver.h:
- Add TSPPoint struct and TSPSolver class with 2-Opt solve method

src/Mod/CAM/App/tsp_solver_pybind.cpp:
- Add pybind11 wrapper exposing the TSP solver to Python as tsp_solver.solve

src/Mod/CAM/PathScripts/PathUtils.py:
- Add sort_locations_tsp Python wrapper for the C++ TSP solver
- Use tsp_solver.solve for TSP-based

src/Mod/CAM/PathScripts/PathUtils.py

@@ -2,6 +2,7 @@
 
 # ***************************************************************************
 # *   Copyright (c) 2014 Dan Falck <ddfalck@gmail.com>                      *
+# *   Copyright (c) 2025 Billy Huddleston <billy@ivdc.com>                  *
 # *                                                                         *
 # *   This program is free software; you can redistribute it and/or modify  *
 # *   it under the terms of the GNU Lesser General Public License (LGPL)    *
@@ -29,6 +30,7 @@ import Path
 import Path.Main.Job as PathJob
 import math
 from numpy import linspace
+import tsp_solver
 
 # lazily loaded modules
 from lazy_loader.lazy_loader import LazyLoader
@@ -611,6 +613,17 @@ def sort_locations(locations, keys, attractors=None):
     return out
 
 
+def sort_locations_tsp(locations, keys, attractors=None):
+    """
+    Python wrapper for the C++ TSP solver. Takes a list of dicts (locations),
+    a list of keys (e.g. ['x', 'y']), and optional attractors.
+    Returns the sorted list of locations in TSP order, starting at (0,0).
+    """
+    points = [(loc[keys[0]], loc[keys[1]]) for loc in locations]
+    order = tsp_solver.solve(points)
+    return [locations[i] for i in order]
+
+
 def guessDepths(objshape, subs=None):
     """
     takes an object shape and optional list of subobjects and returns a depth_params