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

Extract nav tabs, detail modal, table row, stats grid, search/filter,
records table, pagination, and data-loading hook into _components/ and
_hooks/. page.tsx reduced from 833 to 114 LOC.

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

admin-compliance/app/sdk/einwilligungen/_components/StatsGrid.tsx

@@ -0,0 +1,31 @@
+'use client'
+
+interface StatsGridProps {
+  total: number
+  active: number
+  revoked: number
+  versionUpdates: number
+}
+
+export function StatsGrid({ total, active, revoked, versionUpdates }: StatsGridProps) {
+  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">Aktive Einwilligungen</div>
+        <div className="text-3xl font-bold text-green-600">{active}</div>
+      </div>
+      <div className="bg-white rounded-xl border border-red-200 p-6">
+        <div className="text-sm text-red-600">Widerrufen</div>
+        <div className="text-3xl font-bold text-red-600">{revoked}</div>
+      </div>
+      <div className="bg-white rounded-xl border border-blue-200 p-6">
+        <div className="text-sm text-blue-600">Versions-Updates</div>
+        <div className="text-3xl font-bold text-blue-600">{versionUpdates}</div>
+      </div>
+    </div>
+  )
+}