feat(v3.2): CI/CD config + Python bindings setup

- Add .gitea/workflows/build.yml (build, test, docs, python binding CI)
- Add root pyproject.toml + setup.py (CMake-based pip install)
- Add root vde/__init__.py (Python package entry point)
- Update README: CI badge, version 3.2.0, Python install instructions
- Bump project version to 3.2.0 across CMakeLists.txt, python/setup.py, python/vde/__init__.py
- Add build_py/ to .gitignore

setup.py

@@ -0,0 +1,95 @@
+"""
+ViewDesignEngine — CMake-based Python bindings.
+
+Build & install:
+    pip install -e .          # editable install
+    pip install .             # regular install
+
+Requires: CMake ≥ 3.16, C++17, Eigen3 (auto-fetched), pybind11.
+"""
+from setuptools import setup
+from setuptools.command.build_ext import build_ext
+from setuptools.command.build_py import build_py
+import subprocess
+import sys
+import shutil
+import os
+from pathlib import Path
+
+ROOT = Path(__file__).parent.resolve()
+PKG_DIR = ROOT / "vde"
+
+
+class CMakeBuildExt(build_ext):
+    """Build the native _vde module via CMake."""
+
+    def run(self):
+        build_dir = ROOT / "build_py"
+        build_dir.mkdir(exist_ok=True)
+
+        # ── Configure ──
+        subprocess.check_call(
+            [
+                "cmake",
+                "-B", str(build_dir),
+                "-DVDE_BUILD_PYTHON=ON",
+                "-DCMAKE_BUILD_TYPE=Release",
+                "-DBUILD_TESTS=OFF",
+                "-DBUILD_BENCHMARKS=OFF",
+                "-DBUILD_EXAMPLES=OFF",
+            ],
+            cwd=str(ROOT),
+        )
+
+        # ── Build ──
+        parallel = str(os.cpu_count() or 4)
+        subprocess.check_call(
+            ["cmake", "--build", str(build_dir), "-j", parallel],
+            cwd=str(ROOT),
+        )
+
+        # ── Copy .so / .pyd to package dir ──
+        so_suffix = ".cpython-*-linux-gnu.so" if sys.platform == "linux" else "*.so"
+        so_glob = "*.pyd" if sys.platform == "win32" else so_suffix
+
+        so_files = list(build_dir.glob(f"python/{so_glob}"))
+        so_files += list(build_dir.glob(f"python/**/{so_glob}"))
+
+        if not so_files:
+            # fallback: search whole build tree
+            so_files = list(build_dir.rglob(f"_vde{so_glob}"))
+            so_files += list(build_dir.rglob(f"_vde*.so"))
+
+        for so in so_files:
+            dest = PKG_DIR / so.name
+            print(f"Installing {so.name} → {dest}")
+            shutil.copy2(str(so), str(dest))
+            break  # copy first match
+
+
+class CMakeBuildPy(build_py):
+    """Ensure native build runs before packaging."""
+
+    def run(self):
+        self.run_command("build_ext")
+        super().run()
+
+
+setup(
+    name="vde",
+    version="3.2.0",
+    description="High-performance C++ CAD geometry engine",
+    long_description=(ROOT / "README.md").read_text(encoding="utf-8")
+    if (ROOT / "README.md").exists()
+    else "",
+    long_description_content_type="text/markdown",
+    url="https://github.com/ViewDesignEngine/ViewDesignEngine",
+    packages=["vde"],
+    package_dir={"vde": "vde"},
+    cmdclass={
+        "build_ext": CMakeBuildExt,
+        "build_py": CMakeBuildPy,
+    },
+    python_requires=">=3.8",
+    zip_safe=False,
+)