Add dd0c Console — modular React dashboard with drift module

- Vite + React + TypeScript + Tailwind CSS
- Shell: auth provider, entitlement gate, dynamic sidebar
- Shared components: Button, Card, Table, Badge, Modal, EmptyState, PageHeader
- Drift module: dashboard, detail view, report viewer
- Module manifest pattern for pluggable product UIs
- Dockerfile: multi-stage node:22-slim → nginx:alpine
- 189KB JS + 17KB CSS (65KB gzipped)

products/console/src/shared/PageHeader.tsx

@@ -0,0 +1,19 @@
+import React from 'react';
+
+interface PageHeaderProps {
+  title: string;
+  description?: string;
+  action?: React.ReactNode;
+}
+
+export function PageHeader({ title, description, action }: PageHeaderProps) {
+  return (
+    <div className="flex items-start justify-between mb-6">
+      <div>
+        <h1 className="text-2xl font-bold text-white tracking-tight">{title}</h1>
+        {description && <p className="text-gray-500 text-sm mt-1">{description}</p>}
+      </div>
+      {action && <div>{action}</div>}
+    </div>
+  );
+}