feat: Add cover art support and auto-migration

- Extract cover art from MP3s during upload
- Display cover art in game result screens (win/loss)
- Add coverImage field to Song model
- Add migration script to backfill covers for existing songs
- Configure Docker to run migration script on startup

app/admin/page.tsx

@@ -35,6 +35,10 @@ export default function AdminPage() {
     const [currentPage, setCurrentPage] = useState(1);
     const itemsPerPage = 10;
 
+    // Audio state
+    const [playingSongId, setPlayingSongId] = useState<number | null>(null);
+    const [audioElement, setAudioElement] = useState<HTMLAudioElement | null>(null);
+
     const handleLogin = async () => {
         const res = await fetch('/api/admin/login', {
             method: 'POST',
@@ -132,6 +136,29 @@ export default function AdminPage() {
         }
     };
 
+    const handlePlayPause = (song: Song) => {
+        if (playingSongId === song.id) {
+            // Pause current song
+            audioElement?.pause();
+            setPlayingSongId(null);
+        } else {
+            // Stop any currently playing song
+            audioElement?.pause();
+
+            // Play new song
+            const audio = new Audio(`/uploads/${song.filename}`);
+            audio.play();
+            setAudioElement(audio);
+            setPlayingSongId(song.id);
+
+            // Reset when song ends
+            audio.onended = () => {
+                setPlayingSongId(null);
+                setAudioElement(null);
+            };
+        }
+    };
+
     // Filter and sort songs
     const filteredSongs = songs.filter(song =>
         song.title.toLowerCase().includes(searchQuery.toLowerCase()) ||
@@ -297,6 +324,13 @@ export default function AdminPage() {
                                             <td style={{ padding: '0.75rem', color: '#666' }}>{song.activations}</td>
                                             <td style={{ padding: '0.75rem' }}>
                                                 <div style={{ display: 'flex', gap: '0.5rem' }}>
+                                                    <button
+                                                        onClick={() => handlePlayPause(song)}
+                                                        style={{ fontSize: '1.25rem', cursor: 'pointer', border: 'none', background: 'none' }}
+                                                        title={playingSongId === song.id ? "Pause" : "Play"}
+                                                    >
+                                                        {playingSongId === song.id ? '⏸️' : '▶️'}
+                                                    </button>
                                                     <button
                                                         onClick={() => startEditing(song)}
                                                         style={{ fontSize: '1.25rem', cursor: 'pointer', border: 'none', background: 'none' }}