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/App/tsp_solver_pybind.cpp

@@ -0,0 +1,44 @@
+/***************************************************************************
+ *   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)    *
+ *   as published by the Free Software Foundation; either version 2 of     *
+ *   the License, or (at your option) any later version.                   *
+ *   for detail see the LICENCE text file.                                 *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU Library General Public License for more details.                  *
+ *                                                                         *
+ *   You should have received a copy of the GNU Library General Public     *
+ *   License along with this program; if not, write to the Free Software   *
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  *
+ *   USA                                                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#include <pybind11/pybind11.h>
+#include <pybind11/stl.h>
+#include "tsp_solver.h"
+
+namespace py = pybind11;
+
+std::vector<int> tspSolvePy(const std::vector<std::pair<double, double>>& points)
+{
+    std::vector<TSPPoint> pts;
+    for (const auto& p : points) {
+        pts.emplace_back(p.first, p.second);
+    }
+    return TSPSolver::solve(pts);
+}
+
+PYBIND11_MODULE(tsp_solver, m)
+{
+    m.doc() = "Simple TSP solver (2-Opt) for FreeCAD";
+    m.def("solve",
+          &tspSolvePy,
+          py::arg("points"),
+          "Solve TSP for a list of (x, y) points using 2-Opt, returns visit order");
+}