- Dockerfile: 3-stage build (frontend npm build → backend go build → alpine runtime)
- Frontend dist files served from disk at /app/frontend/dist
- server.go: catch-all GET handler serves static files with SPA fallback to index.html
- config.go: new server.frontend_dir option (env: SUB_STORE_SERVER_FRONTEND_DIR)
- API routes (/api/*), download routes, and /health take priority over static serving