- Add analytics tables (analytics_events, analytics_daily)
- Add /api/admin/leads endpoint for lead listing
- Add /api/admin/analytics/overview and /api/admin/analytics/charts endpoints
- Seed database with 15 leads and 30 days of analytics data
- Update dashboard.html with:
- Animated counters for stats
- Performance chart (views/leads over 6 months)
- Leads status pie chart
- Property types bar chart
- Traffic sources doughnut chart
- Top properties horizontal bar chart
- Recent properties table with images
- Recent leads list with status badges
- Add API methods: getAnalyticsOverview(), getAnalyticsCharts()