refactor(admin): split requirements page.tsx into colocated components

Break 838-line page.tsx into _types.ts, _data.ts (templates),
_components/{AddRequirementForm,RequirementCard,LoadingSkeleton}.tsx,
and _hooks/useRequirementsData.ts. page.tsx is now 246 LOC (wiring
only). No behavior changes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

admin-compliance/app/sdk/requirements/_components/LoadingSkeleton.tsx

@@ -0,0 +1,18 @@
+'use client'
+
+export function LoadingSkeleton() {
+  return (
+    <div className="space-y-4">
+      {[1, 2, 3].map(i => (
+        <div key={i} className="bg-white rounded-xl border border-gray-200 p-6 animate-pulse">
+          <div className="flex items-center gap-2 mb-3">
+            <div className="h-5 w-20 bg-gray-200 rounded" />
+            <div className="h-5 w-16 bg-gray-200 rounded-full" />
+          </div>
+          <div className="h-6 w-3/4 bg-gray-200 rounded mb-2" />
+          <div className="h-4 w-full bg-gray-100 rounded" />
+        </div>
+      ))}
+    </div>
+  )
+}