Consolidate to single dlp_io module and publish release artifacts via Gitea Actions

setup.py

@@ -0,0 +1,33 @@
+"""Build hook for dlp-io.
+
+Default builds (``python -m build``) stay pure Python and produce the
+``py3-none-any`` wheel declared in ``pyproject.toml``.
+
+Setting ``DLP_IO_PYD=1`` compiles the single ``dlp_io`` module into a C
+extension with Cython, producing a platform wheel (for example
+``cp313-cp313-win_amd64``) that ships one ``.pyd`` binary instead of
+the ``.py`` source.
+"""
+
+from __future__ import annotations
+
+import os
+
+from setuptools import setup
+
+_BUILD_PYD = os.environ.get("DLP_IO_PYD") == "1"
+_MODULE = "dlp_io"
+
+if _BUILD_PYD:
+    from Cython.Build import cythonize
+
+    setup(
+        ext_modules=cythonize(
+            [f"{_MODULE}.py"],
+            build_dir=os.path.join("build", "cython"),
+            compiler_directives={"language_level": "3"},
+        ),
+        py_modules=[],
+    )
+else:
+    setup(py_modules=[_MODULE])