chore(main): release bindings-c 1.0.0

[github-actions]

🤖 I have created a release beep boop

1.0.0 (2026-05-28)

⚠ BREAKING CHANGES

• core: img2num::labels_to_svg now returns std::string instead of char*. Callers using the C++ API must update their code to capture the return value as std::string and remove any associated std::free / delete[] calls. Callers using the C binding (cimg2num) are unaffected at the ABI level but should use img2num_free_svg to deallocate the returned buffer.
• api: remove draw_contour_borders from labels_to_svg (#283)

✨ Features

• library, bindings, examples: C bindings, C & C++ shared libs, C & C++ example apps (#263) (bb2403e)
• unified image_to_svg function as complete pipeline (#335) (bdba68c)

♻️ Refactoring

• api: remove draw_contour_borders from labels_to_svg (#283) (eee9b31)
• core: update labels_to_svg to return std::string (#333) (a71e3b1)

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