feat: add Streamlit visualization dashboard

- Create interactive dashboard with company analysis page
- Add batch analysis with progress tracking and charts
- Include analytics page for historical data visualization
- Add system status monitoring
- Update requirements.txt with streamlit, plotly, pandas
- Document dashboard usage in README

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

requirements.txt

@@ -9,3 +9,6 @@ psycopg2-binary
 fastapi
 uvicorn[standard]
 httpx
+streamlit
+plotly
+pandas