Add frontend infrastructure for displaying baseline anomalies:
- useAnomalies hook for fetching and caching anomaly data
- AnomalyCell component for displaying multiple anomalies
- AnomalyIndicator/AnomalyBadge components for inline display
- Update EnhancedCPUBar to accept optional anomaly prop
The anomaly endpoint is polled every 30 seconds and cached.
Anomaly badges show severity (color) and deviation ratio (e.g., '2.5x').
This prepares the UI for displaying real-time baseline deviations
without requiring LLM interaction.
