refactor(admin): split controls, training, control-provenance, iace/verification pages

Each page.tsx exceeded the 500-LOC hard cap. Extracted components and hooks into
colocated _components/ and _hooks/ directories; page.tsx is now a thin orchestrator.

- controls/page.tsx: 944 → 180 LOC; extracted ControlCard, AddControlForm,
  LoadingSkeleton, TransitionErrorBanner, StatsCards, FilterBar, RAGPanel into
  _components/ and useControlsData, useRAGSuggestions into _hooks/; types into _types.ts
- training/page.tsx: 780 → 288 LOC; extracted ContentTab (inline content generator tab)
  into _components/ContentTab.tsx
- control-provenance/page.tsx: 739 → 122 LOC; extracted MarkdownRenderer, UsageBadge,
  PermBadge, LicenseMatrix, SourceRegistry into _components/; PROVENANCE_SECTIONS
  static data into _data/provenance-sections.ts
- iace/[projectId]/verification/page.tsx: 673 → 196 LOC; extracted StatusBadge,
  VerificationForm, CompleteModal, SuggestEvidenceModal, VerificationTable into _components/

Zero behavior changes; logic relocated verbatim.

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

admin-compliance/app/sdk/controls/_components/StatsCards.tsx

@@ -0,0 +1,32 @@
+export function StatsCards({
+  total,
+  implementedCount,
+  avgEffectiveness,
+  partialCount,
+}: {
+  total: number
+  implementedCount: number
+  avgEffectiveness: number
+  partialCount: number
+}) {
+  return (
+    <div className="grid grid-cols-1 md:grid-cols-4 gap-4">
+      <div className="bg-white rounded-xl border border-gray-200 p-6">
+        <div className="text-sm text-gray-500">Gesamt</div>
+        <div className="text-3xl font-bold text-gray-900">{total}</div>
+      </div>
+      <div className="bg-white rounded-xl border border-green-200 p-6">
+        <div className="text-sm text-green-600">Implementiert</div>
+        <div className="text-3xl font-bold text-green-600">{implementedCount}</div>
+      </div>
+      <div className="bg-white rounded-xl border border-purple-200 p-6">
+        <div className="text-sm text-purple-600">Durchschn. Wirksamkeit</div>
+        <div className="text-3xl font-bold text-purple-600">{avgEffectiveness}%</div>
+      </div>
+      <div className="bg-white rounded-xl border border-yellow-200 p-6">
+        <div className="text-sm text-yellow-600">Teilweise</div>
+        <div className="text-3xl font-bold text-yellow-600">{partialCount}</div>
+      </div>
+    </div>
+  )
+}