refactor(admin): split workshop, vendor-compliance, advisory-board/documentation pages

Each page.tsx was >500 LOC (610/602/596). Extracted React components to
_components/ and custom hook to _hooks/ per-route, reducing all three
page.tsx orchestrators to 107/229/120 LOC respectively. Zero behavior changes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

admin-compliance/app/sdk/vendor-compliance/_components/StatCard.tsx

@@ -0,0 +1,30 @@
+import Link from 'next/link'
+
+export function StatCard({
+  title,
+  value,
+  description,
+  href,
+  color,
+}: {
+  title: string
+  value: number
+  description: string
+  href: string
+  color: 'blue' | 'purple' | 'green' | 'red'
+}) {
+  const colors = {
+    blue: 'bg-blue-50 dark:bg-blue-900/20',
+    purple: 'bg-purple-50 dark:bg-purple-900/20',
+    green: 'bg-green-50 dark:bg-green-900/20',
+    red: 'bg-red-50 dark:bg-red-900/20',
+  }
+
+  return (
+    <Link href={href} className={`${colors[color]} rounded-lg p-6 hover:opacity-80 transition-opacity`}>
+      <p className="text-sm font-medium text-gray-600 dark:text-gray-400">{title}</p>
+      <p className="mt-2 text-3xl font-bold text-gray-900 dark:text-white">{value}</p>
+      <p className="mt-1 text-sm text-gray-500 dark:text-gray-400">{description}</p>
+    </Link>
+  )
+}