Add Lidarr library update command and UI trigger

server.js

@@ -176,6 +176,30 @@ async function triggerAlbumSearch(albumId) {
   });
 }
 
+async function triggerLibraryUpdate() {
+  const started = [];
+
+  try {
+    await lidarrRequest('post', '/api/v1/command', { name: 'RescanFolders' });
+    started.push('RescanFolders');
+  } catch (err) {
+    console.warn('RescanFolders konnte nicht gestartet werden:', err.message);
+  }
+
+  try {
+    await lidarrRequest('post', '/api/v1/command', { name: 'RefreshArtist' });
+    started.push('RefreshArtist');
+  } catch (err) {
+    console.warn('RefreshArtist konnte nicht gestartet werden:', err.message);
+  }
+
+  if (started.length === 0) {
+    throw new Error('Kein Bibliothek-Update-Kommando konnte in Lidarr gestartet werden.');
+  }
+
+  return started;
+}
+
 async function cleanupUnselectedTrackFiles(albumId, selectedTrackIds) {
   const allFiles = await fetchTrackFiles(albumId);
   if (!Array.isArray(allFiles) || allFiles.length === 0) {
@@ -416,6 +440,17 @@ app.post('/api/lidarr/send-album', async (req, res) => {
   }
 });
 
+app.post('/api/lidarr/update-library', async (_req, res) => {
+  try {
+    const commandNames = await triggerLibraryUpdate();
+    res.json({ success: true, commandNames });
+  } catch (err) {
+    const status = err.response?.status || 500;
+    const details = err.response?.data || err.message;
+    res.status(status).json({ error: typeof details === 'string' ? details : JSON.stringify(details) });
+  }
+});
+
 app.get('*', (_req, res) => {
   res.sendFile(path.join(__dirname, 'public', 'index.html'));
 });