flatten app to repo root and update docker deployment for single-stack runtime

components/dashboard/metric-card.tsx

@@ -0,0 +1,23 @@
+import { cn } from '@/lib/utils';
+
+type MetricCardProps = {
+  label: string;
+  value: string;
+  delta?: string;
+  positive?: boolean;
+  className?: string;
+};
+
+export function MetricCard({ label, value, delta, positive = true, className }: MetricCardProps) {
+  return (
+    <div className={cn('rounded-xl border border-[color:var(--line-weak)] bg-[color:var(--panel-soft)] p-4', className)}>
+      <p className="text-xs uppercase tracking-[0.2em] text-[color:var(--terminal-muted)]">{label}</p>
+      <p className="mt-2 text-2xl font-semibold text-[color:var(--terminal-bright)]">{value}</p>
+      {delta ? (
+        <p className={cn('mt-2 text-xs', positive ? 'text-[#96f5bf]' : 'text-[#ff9898]')}>
+          {delta}
+        </p>
+      ) : null}
+    </div>
+  );
+}