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

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

admin-compliance/app/sdk/rbac/_api.ts

@@ -0,0 +1,23 @@
+// =============================================================================
+// RBAC API HELPERS
+// =============================================================================
+
+export const API = '/api/sdk/v1/rbac'
+
+export async function apiFetch<T>(path: string, opts?: RequestInit): Promise<T> {
+  const res = await fetch(`${API}/${path}`, {
+    headers: { 'Content-Type': 'application/json' },
+    ...opts,
+  })
+  if (!res.ok) {
+    const err = await res.text()
+    throw new Error(`HTTP ${res.status}: ${err}`)
+  }
+  return res.json()
+}
+
+export function formatDate(iso: string): string {
+  return new Date(iso).toLocaleString('de-DE', {
+    day: '2-digit', month: '2-digit', year: 'numeric',
+  })
+}