[MEDIUM] No Code Quality Tools Configuration

## Issue
No `pyproject.toml` for modern Python tooling, no formatter/linter configuration.

**Location:** Repository root

## Problems
- No `pyproject.toml` for modern Python tooling
- No `ruff` or `black` configuration
- No `mypy` configuration

## Recommended Fix
- Add `pyproject.toml` with tool configurations
- Configure code formatters and linters
- Add type checking configuration

