PHP ML Kit

Built PHP ML Kit as a collection of machine-learning and scientific-computing tools for PHP:

• NDArray, numerical computing inspired by NumPy and powered by Rust through FFI.
• Opal, image processing powered by libvips.
• SoundFile, audio I/O and resampling built on libsndfile and libsamplerate.
• ONNX Runtime PHP, bindings for ONNX model inference.