fix(backend): normalize iTunes lookup across all download paths

- Track path: always fetch iTunes when durationMs/trackNum missing (not just genre)
- Both paths: strip release suffixes from title before iTunes lookup
- Log "Album:" instead of "Album aus Spotify:" (also fires for iTunes global search)
- Log duration when fetched from iTunes so it's visible in job log

Ensures all importers have consistent yt-dlp search filters (duration filter
now always runs when iTunes finds the track).

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

backend/novasonic-server.js

@@ -576,15 +576,19 @@ app.post('/api/download', async (req, res) => {
           if (extra.album) log(jobId, `📋 Album: "${extra.album}" (${extra.year || '?'})`);
           meta = { ...meta, ...extra, artworkUrl: spArt || extra.artworkUrl || '', genre: meta.genre || extra.genre || undefined };
         } else {
-          log(jobId, `📋 Album aus Spotify: "${meta.album}"`);
-          // Spotify enrichment has no genre, totalTracks, or disc info — fetch from iTunes
-          if (!meta.genre || !meta.totalTracks) {
-            const genreMeta = await lookupItunesTrackMeta(searchArtist, title).catch(() => ({}));
+          log(jobId, `📋 Album: "${meta.album}"`);
+          // Always fetch iTunes when any field is missing — durationMs is required for the yt-dlp
+          // duration filter; without it any unrelated video that matches the title text gets downloaded.
+          if (!meta.genre || !meta.totalTracks || !meta.durationMs || !meta.trackNum) {
+            // Strip release-type suffixes before iTunes lookup so "recognize - Single" → "recognize"
+            const RELEASE_SUFFIX_RE = /\s*[-–]\s*(?:(?:official\s+)?(?:music\s+)?(?:single|ep|lp|album|ost|soundtrack|remaster(?:ed)?|deluxe(?:\s+edition)?|bonus\s+tracks?|b-?sides?|version|edit)\b.*|(?:20|19)\d{2})\s*$/i;
+            const itunesTitle = title.replace(RELEASE_SUFFIX_RE, '').trim() || title;
+            const genreMeta = await lookupItunesTrackMeta(searchArtist, itunesTitle).catch(() => ({}));
             if (!meta.genre       && genreMeta.genre)       { meta.genre       = genreMeta.genre;       log(jobId, `📋 Genre: "${genreMeta.genre}"`); }
             if (!meta.totalTracks && genreMeta.totalTracks) { meta.totalTracks = genreMeta.totalTracks; }
             if (!meta.discNum     && genreMeta.discNum)     { meta.discNum     = genreMeta.discNum;     }
             if (!meta.discTotal   && genreMeta.discTotal)   { meta.discTotal   = genreMeta.discTotal;   }
-            if (!meta.durationMs  && genreMeta.durationMs)  { meta.durationMs  = genreMeta.durationMs;  }
+            if (!meta.durationMs  && genreMeta.durationMs)  { meta.durationMs  = genreMeta.durationMs;  log(jobId, `📋 Duration: ${Math.round(genreMeta.durationMs/1000)}s`); }
             if (!meta.trackNum    && genreMeta.trackNum)     { meta.trackNum    = genreMeta.trackNum;    }
           }
         }
@@ -651,6 +655,9 @@ app.post('/api/download', async (req, res) => {
           const batchResults = await Promise.allSettled(batch.map(async track => {
             const trackTitle  = track.trackName  || '';
             const trackArtist = track.artistName || artist || '';
+            // Strip release-type suffixes before iTunes lookup ("Song - Single" → "Song")
+            const RELEASE_SUFFIX_RE = /\s*[-–]\s*(?:(?:official\s+)?(?:music\s+)?(?:single|ep|lp|album|ost|soundtrack|remaster(?:ed)?|deluxe(?:\s+edition)?|bonus\s+tracks?|b-?sides?|version|edit)\b.*|(?:20|19)\d{2})\s*$/i;
+            const itunesTitle = trackTitle.replace(RELEASE_SUFFIX_RE, '').trim() || trackTitle;
             // If the frontend already enriched this track with iTunes data (collectionName +
             // trackNumber + durationMs all present), skip the re-lookup to avoid a different
             // iTunes result overriding the already-correct enriched metadata.
@@ -660,7 +667,7 @@ app.post('/api/download', async (req, res) => {
             if (alreadyEnriched) {
               log(jobId, `📋 Frontend-Metadaten: "${trackArtist} – ${trackTitle}" (${track.collectionName})`);
               // Spotify enrichment copies album/trackNum/duration but not genre/totalTracks/disc — fetch those
-              const genreMeta = await lookupItunesTrackMeta(searchArtist, trackTitle).catch(() => ({}));
+              const genreMeta = await lookupItunesTrackMeta(searchArtist, itunesTitle).catch(() => ({}));
               itunes = {
                 genre:       genreMeta.genre,
                 totalTracks: genreMeta.totalTracks,
@@ -669,7 +676,7 @@ app.post('/api/download', async (req, res) => {
               };
             } else {
               log(jobId, `📋 iTunes: "${trackArtist} – ${trackTitle}"`);
-              itunes = await lookupItunesTrackMeta(searchArtist, trackTitle);
+              itunes = await lookupItunesTrackMeta(searchArtist, itunesTitle);
             }
             // Prefer iTunes-resolved name (from server lookup or frontend enrichment) for sort tags / folders.
             // trackArtist stays as rawArtist for main tags and YTM search.