OPML import subscribes you; export lists only your feeds

Import predated accounts: it only added URLs missing from config.toml
and subscribed nobody. Importing another account's export did nothing
("Imported 0 feed(s)"), and a genuinely new feed had no subscriber, so
it was never scanned. Web and CLI import now share subscribe_opml,
which subscribes the caller (the CLI: the first admin) to every feed in
the file and reports new vs already-subscribed.

Export wrote the whole catalogue to anyone signed in, including other
people's private feed URLs. It now lists only your own subscriptions.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0173mGu6rK18Ne7UGTwAaVJV

web/index.html

@@ -1397,7 +1397,7 @@ function opmlModal(){
   $('#oimp').onclick=async()=>{
     try{
       const r=await api('/api/opml',{method:'POST',body:JSON.stringify({xml:$('#opmlText').value})});
-      closeModal(); toast(`Imported ${r.added} feed(s)`); loadFeeds(true);
+      closeModal(); toast(`Subscribed to ${r.added} feed(s)`+(r.already?`, ${r.already} you already had`:'')); loadFeeds(true);
     }catch(e){ toast(e.message,true); }
   };
 }