Fix GitHub Actions workflow: Update Python version requirements

- Update CI workflow to Python 3.9-3.12 (from 3.7-3.11)
- Python 3.7 and 3.8 no longer available on ubuntu-latest (Ubuntu 24.04)
- Add fail-fast: false to continue testing on failures
- Update all documentation to reflect Python 3.9+ requirement

Files updated:
- .github/workflows/tests.yml - New Python versions
- README.md - Badge updated to Python 3.9+
- CLAUDE.md - Prerequisites updated
- CONTRIBUTING.md - Prerequisites updated
- docs/MCP_SETUP.md - Prerequisites updated

This fixes the failing GitHub Actions tests.

README.md

@@ -2,7 +2,7 @@
 
 [![Version](https://img.shields.io/badge/version-1.0.0-blue.svg)](https://github.com/yusufkaraaslan/Skill_Seekers/releases/tag/v1.0.0)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
-[![Python 3.7+](https://img.shields.io/badge/python-3.7+-blue.svg)](https://www.python.org/downloads/)
+[![Python 3.9+](https://img.shields.io/badge/python-3.9+-blue.svg)](https://www.python.org/downloads/)
 [![MCP Integration](https://img.shields.io/badge/MCP-Integrated-blue.svg)](https://modelcontextprotocol.io)
 [![Tested](https://img.shields.io/badge/Tests-14%20Passing-brightgreen.svg)](tests/)