Extend fine-grained ACL to settings, content, shop, and radio.

Gate pages and mutations on module PERMS instead of dashboard-only staff checks, add radio view/edit slugs with migration 0015, and expand the operations contract tests.

Co-authored-by: Cursor <[email protected]>

src/app/admin/radio/layout.tsx

@@ -0,0 +1,15 @@
+import { redirect } from "next/navigation";
+import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
+
+export default async function RadioAdminLayout({
+	children,
+}: {
+	children: React.ReactNode;
+}) {
+	const { session, permissions } = await getAdminContext();
+	if (!canAccess(permissions, PERMS.RADIO_VIEW, session.user.rank)) {
+		redirect("/admin");
+	}
+
+	return children;
+}