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/_components/ModalBase.tsx

@@ -0,0 +1,17 @@
+'use client'
+
+import React from 'react'
+
+export function ModalBase({ title, onClose, children }: { title: string; onClose: () => void; children: React.ReactNode }) {
+  return (
+    <div className="fixed inset-0 bg-black/50 flex items-center justify-center z-50 p-4">
+      <div className="bg-white rounded-xl shadow-xl max-w-lg w-full max-h-[90vh] overflow-y-auto">
+        <div className="flex items-center justify-between p-5 border-b border-gray-200">
+          <h3 className="text-lg font-semibold">{title}</h3>
+          <button onClick={onClose} className="text-gray-400 hover:text-gray-600 text-xl">&times;</button>
+        </div>
+        <div className="p-5">{children}</div>
+      </div>
+    </div>
+  )
+}