Bundled package into sdist so you can directly install via pip install pyofm

[afshawnlotfi]

🚀 Transform pyOFM into Modern PyPI Package with Automatic Build System

https://pypi.org/project/pyofm/

Overview

This PR transforms pyOFM from requiring manual make steps into a fully automatic PyPI package that seamlessly compiles Cython extensions during pip install.

✨ Key Changes

🏗️ Automatic Build System

• Enhanced setup.py: Added build_cython_extension() that:
  • Auto-detects OpenFOAM environment (FOAM_SRC, FOAM_LIBBIN)
  • Compiles Cython extensions using OpenFOAM's proven wmake system
  • Works in both repository and PyPI sdist contexts
  • Gracefully falls back to pure Python when OpenFOAM unavailable

📦 Modern Python Packaging

• pyproject.toml: Modern build system configuration
• MANIFEST.in: Proper source file inclusion for sdist
• Enhanced Makefile: Added packaging targets (dist, wheel, sdist, upload-pypi)
• Updated README.md: Comprehensive installation instructions

🎯 User Experience Transformation

Before:

source /path/to/openfoam/etc/bashrc
make
pip install .

After:

source /path/to/openfoam/etc/bashrc
pip install pyofm  # ONE COMMAND - AUTOMATIC COMPILATION!

✅ Verified Functionality

• ✅ Local repository installation with automatic compilation
• ✅ Source distribution (sdist) creation and installation
• ✅ Real-world mesh loading performance (32.5M points, 96.2M faces)
• ✅ Cross-platform compatibility (ARM64/x86_64)

🚀 PyPI Deployment Ready

Package is now ready for PyPI publication with seamless user experience.

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📋 PyPI Ownership Transfer

I can transfer PyPI package ownership to you through these steps:

1. Package Publication: I'll publish the initial version to PyPI under a temporary account
2. Add You as Owner: Add your PyPI username as package owner/maintainer
3. Transfer Ownership: Transfer full ownership to your account
4. Remove Temporary Access: Clean up temporary access