refactor: migrate from setup.py to pipx-based installation and update configuration

Add entry point for yfinance-mcp-server in __main__.py

Update project files: add version.py to .gitignore, simplify license declaration in pyproject.toml and setup.py, and adjust GitHub Actions workflow for setuptools_scm compatibility.

Update project configuration to use setuptools_scm for versioning and add it as a requirement

Update supported python versions

Fix CI/CD

Fix CI/CD

Fix changes

inital commit