Serve React frontend as static files from Express backend

[railway-app]

Summary

Integrates the Vite/React frontend into the same Railway service as the Express backend. The backend's build script now installs frontend dependencies and runs vite build, copying the output into backend/frontend-dist. Express serves that directory as static files, with a catch-all route that returns index.html for client-side navigation. A railway.toml at the repo root sets the build and start commands so Railway runs from the repo root rather than the backend/ subdirectory. The frontend API base URL fallback is updated from the hardcoded localhost:5000 to a relative /api path, so it works correctly when served from the same origin in production without any environment variable.

Changes

• Modified backend/index.js
• Modified backend/package.json
• Created railway.toml
• Modified frontend/src/api/index.js

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Generated by Railway