Fix Play button 404: bundle path and field name

- .jsdos bundles saved flat in data/games/ so /games/{id}.jsdos serves them
- bundleUrl() uses game.id (matches JSON) instead of game.slug (undefined)
- Delete handler also removes flat .jsdos bundle on game deletion

frontend/src/lib/api.js

@@ -75,7 +75,7 @@ export function artworkUrl(path) {
 export function bundleUrl(game) {
   if (!game) return null;
   if (game.bundle_type === "sockdrive") {
-    return `/api/sockdrive/${game.slug}/file?path=.jsdos/dosbox.conf`;
+    return `/api/sockdrive/${game.id}/file?path=.jsdos/dosbox.conf`;
   }
-  return `/games/${game.slug}.jsdos`;
+  return `/games/${game.id}.jsdos`;
 }