Add model performance comparison dashboard

Description

Create a dashboard to compare ML model performance metrics across different model versions and experiments.

Features

• Metrics visualization (accuracy, F1, precision, recall)
• Side-by-side model comparison
• Historical performance trends
• Export comparison reports
• Filter by date range and model type

Tech Stack

• Chart.js or D3.js for visualizations
• React Query for data fetching
• TypeScript strict mode

cc @jean @stan