Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/app/api/radio/embed-config/route.ts

@@ -6,12 +6,7 @@ import { prisma } from "@/lib/prisma";
 // flat { key: value } map. None of these keys are secrets.
 export const dynamic = "force-dynamic";
 
-const EMBED_KEYS = [
-  "radio_enabled",
-  "radio_name",
-  "radio_stream_url",
-  "radio_auto_play",
-];
+const EMBED_KEYS = ["radio_enabled", "radio_name", "radio_stream_url", "radio_auto_play"];
 
 export async function GET(_req: Request) {
   try {