When a user has not configured their own model keys in localStorage,
engine calls now automatically route through /api/* server routes
instead of throwing "模型配置未设置". This lets Vercel deploys with
server-side environment variables work out of the box.
- Add lib/engineClient.ts as a unified client-side routing layer:
checks localStorage for BYO config, falls back to POST /api/start,
/api/scene, /api/vision, /api/classify-freeform, /api/insert-beat
- Update app/play/page.tsx to use engineClient instead of direct
engine imports; remove buildEngineConfig()
- Update app/page.tsx style-image parsing to also fall back to
/api/parse-style-image when no local model config exists
Signed-off-by: zhi <zhi@peropero.net>
baizhi958216