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

pyproject.toml

@@ -0,0 +1,32 @@
+[build-system]
+requires = ["setuptools>=61.0", "pybind11>=2.10", "cmake>=3.16"]
+build-backend = "setuptools.backends._legacy:_Backend"
+
+[project]
+name = "vde"
+version = "3.2.0"
+description = "High-performance C++ CAD geometry engine"
+readme = "README.md"
+license = {text = "Apache-2.0"}
+requires-python = ">=3.8"
+keywords = ["cad", "geometry", "computational-geometry", "brep", "sdf", "mesh"]
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Intended Audience :: Science/Research",
+    "License :: OSI Approved :: Apache Software License",
+    "Programming Language :: C++",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Topic :: Scientific/Engineering",
+]
+
+[project.urls]
+Homepage = "https://github.com/ViewDesignEngine/ViewDesignEngine"
+Documentation = "https://github.com/ViewDesignEngine/ViewDesignEngine/tree/main/docs"
+
+[tool.setuptools]
+packages = ["vde"]