feat: add album routes, playlist detail, liked tracks, fix search/artist routing

src/controllers/searchController.js

@@ -1,3 +1,4 @@
+import mongoose from 'mongoose';
 import Track from '../models/Track.js';
 
 export const searchController = {
@@ -26,11 +27,42 @@ export const searchController = {
         .limit(50)
         .lean();
 
-      const artistNames = [...new Set(tracks.map(t => t.artist))];
-      const artists = artistNames.map(name => ({ name }));
+      const artistMap = new Map();
+      tracks.forEach(t => {
+        if (!artistMap.has(t.artist)) {
+          artistMap.set(t.artist, {
+            _id: new mongoose.Types.ObjectId(),
+            name: t.artist,
+            imageUrl: t.coverUrl || '',
+            trackCount: 0,
+          });
+        }
+        const entry = artistMap.get(t.artist);
+        entry.trackCount++;
+        if (t.coverUrl && !entry.imageUrl) {
+          entry.imageUrl = t.coverUrl;
+        }
+      });
+      const artists = [...artistMap.values()];
 
-      const albumNames = [...new Set(tracks.map(t => t.album))];
-      const albums = albumNames.map(name => ({ name }));
+      const albumMap = new Map();
+      tracks.forEach(t => {
+        if (!albumMap.has(t.album)) {
+          albumMap.set(t.album, {
+            _id: new mongoose.Types.ObjectId(),
+            title: t.album,
+            artist: t.artist,
+            coverUrl: t.coverUrl || '',
+            trackCount: 0,
+          });
+        }
+        const entry = albumMap.get(t.album);
+        entry.trackCount++;
+        if (t.coverUrl && !entry.coverUrl) {
+          entry.coverUrl = t.coverUrl;
+        }
+      });
+      const albums = [...albumMap.values()];
 
       const data = { tracks, artists, albums };