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/actions/admin-radio-points.ts

@@ -2,7 +2,8 @@
 
 import { revalidatePath } from "next/cache";
 import { redirect } from "next/navigation";
-import { requireStaff } from "@/lib/admin/guard";
+import { requirePermission } from "@/lib/admin/guard";
+import { PERMS } from "@/lib/permissions";
 import { prisma } from "@/lib/prisma";
 import { siteSettings } from "@/lib/services/site-settings";
 import { logStaffActivity } from "@/lib/services/staff-activity";
@@ -46,7 +47,7 @@ function intStr(raw: FormDataEntryValue | null): string {
 }
 
 export async function savePoints(formData: FormData): Promise<void> {
-	const staff = await requireStaff();
+	const staff = await requirePermission(PERMS.RADIO_EDIT);
 
 	const currencyRaw = str(formData.get("radio_points_currency"))
 		.trim()