Remove comments from backend and web-player source

Strip //, /* */ and XML doc comments from all backend .cs files, and
JS/TS/CSS/HTML comments from web-player source (.ts, .svelte, .css),
per the project's no-comments convention.

web-player/src/routes/(app)/explore/+page.server.ts

@@ -11,8 +11,6 @@ export const load: PageServerLoad = async ({ url, locals, fetch }) => {
 	const query = url.searchParams.get('q')?.trim() ?? '';
 	const page = Math.max(1, Number(url.searchParams.get('page')) || 1);
 
-	// This page is reachable without a session when anonymous listening is on
-	// (see +layout.server.ts), so `user` may be null here.
 	const user = locals.user;
 	const api = createApiClient({ fetch, accessToken: locals.accessToken ?? undefined });