feat: Major update with validators, skills, dashboard, and docs reorganization

- Add validation framework (config, model, results, study validators)
- Add Claude Code skills (create-study, run-optimization, generate-report,
  troubleshoot, analyze-model)
- Add Atomizer Dashboard (React frontend + FastAPI backend)
- Reorganize docs into structured directories (00-09)
- Add neural surrogate modules and training infrastructure
- Add multi-objective optimization support

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

atomizer-dashboard/frontend/src/components/MetricCard.tsx

@@ -0,0 +1,17 @@
+import React from 'react';
+
+interface MetricCardProps {
+  label: string;
+  value: string | number;
+  className?: string;
+  valueColor?: string;
+}
+
+export function MetricCard({ label, value, className = '', valueColor = 'text-primary-400' }: MetricCardProps) {
+  return (
+    <div className={`bg-dark-500 rounded-lg p-4 ${className}`}>
+      <div className="text-sm text-dark-200 mb-1">{label}</div>
+      <div className={`text-2xl font-bold ${valueColor}`}>{value}</div>
+    </div>
+  );
+}