feat: replace Bandsintown with Ticketmaster for concert events

Backend: swap /api/events/:artist to use Ticketmaster Discovery API
(startDateTime=now, classificationName=music, size=20, sort by date).
Maps TM response to the same {datetime, venue, offers} shape the modal
expects. Returns [] if TICKETMASTER_API_KEY is not set.

Frontend: remove all debug console.logs from events.js; drop redundant
client-side date filter (TM already filters by startDateTime server-side).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/views/events.js

@@ -3,19 +3,14 @@ import { S } from '../state.js';
 
 export async function fetchEvents(artistName) {
   const base = S.cfg?.backendUrl;
-  console.log('[events] base:', base, '| artist:', artistName);
   if(!base) return [];
   try {
     const r = await fetch(`${base}/api/events/${encodeURIComponent(artistName)}`);
-    console.log('[events] status:', r.status);
     if(!r.ok) return [];
     const data = await r.json();
-    console.log('[events] data:', data);
     if(!Array.isArray(data)) return [];
-    const filtered = data.filter(e => new Date(e.datetime) > new Date());
-    console.log('[events] upcoming:', filtered.length);
-    return filtered;
-  } catch(e) { console.log('[events] error:', e); return []; }
+    return data;
+  } catch { return []; }
 }
 
 export function openEventsModal(events, artistName) {