fix: remove Discover APIs tab from login page

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

index.html

@@ -26,27 +26,11 @@
       <div class="logo-icon">♫</div>
       <h1>Nova<em>Sonic</em></h1>
     </div>
-    <div class="setup-tabs">
-      <button class="setup-tab active" onclick="switchSetupTab('navidrome')">Navidrome</button>
-      <button class="setup-tab" onclick="switchSetupTab('discover')">Discover APIs</button>
-    </div>
     <div class="setup-pane active" id="pane-navidrome">
       <div class="field"><label>Server URL</label><input id="srv-url" type="url" placeholder="https://music.example.com"></div>
       <div class="field"><label>Benutzername</label><input id="srv-user" type="text" placeholder="admin"></div>
       <div class="field"><label>Passwort</label><input id="srv-pass" type="password" placeholder="••••••••"></div>
     </div>
-    <div class="setup-pane" id="pane-discover">
-      <div class="field">
-        <label>Last.fm API Key <span style="color:var(--text3);font-weight:400;text-transform:none">(optional)</span></label>
-        <input id="lastfm-key" type="text" placeholder="Kostenlos auf last.fm/api">
-        <div class="hint">Für Empfehlungen & Similar Artists. Kostenlos registrieren unter <strong>last.fm/api/account/create</strong></div>
-      </div>
-      <div class="field">
-        <label>NovaSonic Backend URL <span style="color:var(--text3);font-weight:400;text-transform:none">(optional)</span></label>
-        <input id="backend-url" type="url" placeholder="http://192.168.1.x:3700">
-        <div class="hint">Für Download-to-Server Funktion. Backend separat starten (novasonic-server.js)</div>
-      </div>
-    </div>
     <button class="btn-primary" id="btn-connect" onclick="doConnect()">Verbinden</button>
     <div class="setup-error" id="setup-error"></div>
   </div>