feat(v5-M4): industrial formats + GPU acceleration + Python bindings

M4.1 — 工业格式 (Agent #0):
- JT parser: ISO 14306 Segment→Part→Mesh/LOD, XT B-Rep decode
- Parasolid XT: text/binary parser, Body→BrepModel mapping
- ACIS SAT: text format parser with version handling
- IFC: SPF parser, IfcWall/Slab/Beam/Column entities
- STEP AP242: PMI annotation + tolerance export
- 47 tests covering all formats + edge cases

M4.2 — GPU 加速 (Agent #1):
- CUDA kernels: mc_kernel, qem_cost_kernel, tri_intersect_kernel
- __constant__ memory for edge tables, atomic triangle collection
- CPU fallback when CUDA unavailable (seamless degradation)
- VDE_USE_CUDA CMake option, .cu compilation support
- 9 tests with CPU path validation

M4.3 — Python 绑定 (Agent #2):
- vde_brep: BrepModel, make_*, boolean, STEP/IGES, heal, validate
- vde_sdf: primitives, operations, to_mesh, gradient descent
- vde_cam: roughing/finishing/drilling, Tool, ToolLibrary
- vde_assembly: Assembly, AssemblyNode, interference, explode
- Version: 3.3.0 synced across pyproject/setup/__init__

13 files, ~5200 lines, 56+ tests

python/setup.py

@@ -25,6 +25,10 @@ ext_modules = [
             "src/bind_core.cpp",
             "src/bind_curves.cpp",
             "src/bind_mesh.cpp",
+            "src/vde_brep.cpp",
+            "src/vde_sdf.cpp",
+            "src/vde_cam.cpp",
+            "src/vde_assembly.cpp",
         ]),
         include_dirs=[
             "../include",                # vde headers
@@ -37,7 +41,7 @@ ext_modules = [
 
 setup(
     name="vde",
-    version="3.2.0",
+    version="3.3.0",
     author="ViewDesignEngine Contributors",
     description="CAD computational geometry engine",
     long_description=Path(__file__).parent.joinpath("..", "README.md").read_text(