Add streaming analytics and metrics

Implement analytics for streaming content performance.

Metrics to Track:

• View counts
• Watch time duration
• Concurrent viewers
• Geographic distribution
• Device types
• Buffer rates and quality switches

Implementation:

• Add event tracking endpoints
• Store metrics in time-series DB (InfluxDB/Prometheus)
• Create analytics dashboard
• Add real-time viewer count
• Implement retention metrics

Dashboards:

• Real-time stream health
• Historical analytics
• User engagement metrics