Build Python 3.14 wheels on existing platforms

[bghira]

Summary

• add CPython 3.14 to the existing Linux x86_64, Linux ARM64, and macOS ARM64 wheel matrices
• update PyO3, rust-numpy, ndarray, and maturin compatibility for Python 3.14
• isolate the pinned static OpenCV and FFmpeg build from Homebrew libraries and document the macOS prerequisites

Testing

• GitHub Actions wheel matrix: 12 jobs passed
• strict Rust clippy and 71 Rust tests passed
• CPython 3.14 macOS ARM64 static wheel built, installed, and passed the Python test suite
• wheel dependency inspection confirmed only macOS system frameworks and libraries
• build script syntax, pre-commit checks, and clean-cache rebuild passed