Initial commit: KeySelector implementation

server/routes/cover.js

@@ -0,0 +1,27 @@
+const express = require('express');
+const fetch = require('node-fetch');
+const router = express.Router();
+
+// Fetch cover from iTunes API to avoid frontend CORS issues
+router.get('/', async (req, res) => {
+  const q = req.query.q;
+  if (!q) return res.status(400).json({ error: 'Missing q parameter' });
+  
+  try {
+    const url = `https://itunes.apple.com/search?term=${encodeURIComponent(q)}&media=music&entity=song&limit=1`;
+    const response = await fetch(url);
+    const data = await response.json();
+    
+    if (data.results && data.results[0] && data.results[0].artworkUrl100) {
+      const src = data.results[0].artworkUrl100.replace('100x100bb', '300x300bb');
+      return res.json({ url: src });
+    }
+    
+    res.json({ url: null });
+  } catch (err) {
+    console.error('iTunes cover fetch error', err);
+    res.status(500).json({ error: 'Server error fetching cover' });
+  }
+});
+
+module.exports = router;