Add pyproject.toml and publish package to PyPI

[Nomi]

Create a pyproject.toml for modern Python packaging:

• Define project metadata, dependencies, and build backend (setuptools preferred)
• Move all relevant setup from requirements.txt/setup.py into pyproject.toml where appropriate

Steps:

1. Add/complete pyproject.toml with metadata, dependencies and build info.
2. Adjust project layout for PEP 517/518 compliance (src/ layout already in use)
3. Update CI/test config (pytest) to use pyproject.toml
4. Prepare for PyPI (check README, classifiers, relevant fields)
5. Test build and install with pip install . and pip install -e .
6. Register and publish new version to PyPI following best practices (via a manual review requiring CI/CD pipeline action, following existing deployment standards such as VirusTotal scans)

After this, users should be able to install via pip (pip install cs-prof-analyzer) after release. Can keep requirements.txt as long as direct script-running from source is intended to be supported. Document all install methods in README (PyInstaller exe, source code script run, and pip).