feat: Add real-time visitor map with IP geolocation

- Add latitude/longitude columns to visitor_logs model
- Update visitor_service to fetch and store coordinates from ip-api.com
- Add /admin/map-data API endpoint for map visualization
- Create VisitorMap component using Leaflet/OpenStreetMap
- Integrate map into visitor-stats admin page
- 30-second auto-refresh with animation for new visitors
- Color-coded markers (red: active, blue: recent)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/package-lock.json

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