Add comprehensive data visualization to the runtime detail page:
- Daily token usage stacked area chart and daily cost bar chart
- Model distribution donut chart with cost breakdown
- GitHub-style activity heatmap (13 weeks of daily token usage)
- Hourly task distribution bar chart with new backend endpoint
- Responsive 2-column grid layout for charts on wide screens
Backend: new GET /api/runtimes/{runtimeId}/activity endpoint
returning hourly task counts from agent_task_queue.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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