radio: public read-only tracker for Opa (NL/EN toggle, bigger type and tap targets)

Visitors see frequencies, banks, nets, ISS passes and the log without logging in; every
write stays owner-only (actions check the owner, hooks refuse non-GET). The public payload
drops reminder switches, log notes and inactive nets, and the page no longer shows the
observer coordinates (only "Gouda"). Dutch/English toggle (?lang, cookie, Accept-Language,
NL fallback). Larger fonts, high-contrast labels and 44px+ controls for phones and tablets;
radio listed as public (no lock) and in the sitemap; banks CSV public.

src/routes/trackers/radio/banks.csv/+server.ts

@@ -1,17 +1,15 @@
-import { requireOwner } from '#lib/server/owner.js';
 import { channelRows } from '#lib/server/radio.js';
 import { scannerCsv } from '#lib/radio/index.js';
 import type { RequestHandler } from './$types';
 
-// All 500 scanner memories as CSV (Uniden BC125AT/UBC125XLT programming software column order).
-export const GET: RequestHandler = async (event) => {
-	requireOwner(event);
+// All 500 scanner memories as CSV, public like the page (station frequencies only) (Uniden BC125AT/UBC125XLT programming software column order).
+export const GET: RequestHandler = async () => {
 	const csv = scannerCsv(await channelRows());
 	return new Response(csv, {
 		headers: {
 			'content-type': 'text/csv; charset=utf-8',
 			'content-disposition': 'attachment; filename="ubc125xlt-banks.csv"',
-			'cache-control': 'private, no-store'
+			'cache-control': 'public, max-age=300'
 		}
 	});
 };