perf: drop includeSeries/includeMovie from history fetches

Sonarr/Radarr history with include* params forces expensive DB
joins (~2s each). History records still have seriesId/movieId
for matching; the series/movie objects come from the queue-built
maps instead.

Trade-off: completed downloads only show if the series/movie
is also currently in the queue. Active downloads unaffected.

server/routes/dashboard.js

@@ -157,8 +157,9 @@ router.get('/user-downloads', async (req, res) => {
     const radarrHistory = { data: radarrHistoryData };
     const radarrTags = { data: radarrTagsData };
 
-    // Build series/movie maps from embedded objects in queue + history records
-    // (no need to fetch the full library — queue/history include the full object)
+    // Build series/movie maps from embedded objects in queue records
+    // (history is fetched without includeSeries/includeMovie for speed;
+    //  history matches fall back to the queue-built map via seriesId/movieId)
     const seriesMap = new Map();
     for (const r of sonarrQueue.data.records) {
       if (r.series && r.seriesId) seriesMap.set(r.seriesId, r.series);