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

python/setup.py

@@ -37,7 +37,7 @@ ext_modules = [
 
 setup(
     name="vde",
-    version="1.0.0",
+    version="3.2.0",
     author="ViewDesignEngine Contributors",
     description="CAD computational geometry engine",
     long_description=Path(__file__).parent.joinpath("..", "README.md").read_text(

python/vde/__init__.py

@@ -9,5 +9,5 @@ Submodules:
 """
 from ._vde import core, curves, mesh, sdf
 
-__version__ = "1.0.0"
+__version__ = "3.2.0"
 __all__ = ["core", "curves", "mesh", "sdf"]