feat: Update SSplines to 3.0.0

[qTipTip]

Modernize SSplines: Python 3.13+, pyproject.toml, and CI/CD

Breaking Changes (v3.0.0)

• Python 3.13+ Required: Dropped support for Python < 3.13
• Modern packaging: Migrated from setup.py to pyproject.toml
• NumPy compatibility: Fixed deprecated np.int usage (now uses int)

New Features

Modern Python Packaging

Complete migration to pyproject.toml with proper metadata
uv integration for fast dependency management and building
Enhanced project description, keywords, and classifiers

Automated CI/CD Pipeline

• GitHub Actions workflows for testing on Ubuntu, Windows, and macOS
• Automated PyPI publishing via trusted publishing on tag push
• Coverage reporting with Codecov integration
• Tag-triggered release automation with changelog extraction

[codecov-commenter]

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