docs: add comprehensive documentation for new modules - Issue #48
Documentation updates:
- CHANGELOG.md: Add entries for backtest, alerts, execution, memory,
portfolio, simulation, strategy modules (1672+ tests documented)
- docs/README.md: Add Module Reference section with links to new docs
- docs/modules/backtest.md: Complete backtest module documentation
- BacktestEngine, slippage/commission models
- ResultsAnalyzer metrics and trade statistics
- ReportGenerator for PDF/HTML/JSON/Markdown
- docs/api/rest-api.md: FastAPI REST API reference
- Authentication flow with JWT
- Strategies CRUD endpoints
- Error handling and configuration
Also fixes pytest conftest.py plugin conflict by removing explicit
pytest_plugins registration (pytest auto-discovers sub-conftest files)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
b05cc88797