Save to Files: copy books, free audiobooks and Verse By Verse lessons and handouts into Seafile (background job, progress, skips what is there)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UaC9HmtHMdRP8dAbN4wAKj

librivox.js

@@ -70,4 +70,4 @@ async function handle(req, res) {
   } catch (e) { return json(res, e.code >= 400 && e.code < 600 ? e.code : 502, { error: e.message }); }
 }
 
-module.exports = { handle };
+module.exports = { handle, book, allowed };