Refactor: Decouple Frontend for Static Hosting

[bigtcze]

Summary

To support Scale-to-Zero architecture, the Frontend must be decoupled from the Backend. The Frontend must be served as a static SPA (Single Page Application) from a central point (CDN/Nginx), while the Backend runs in private containers.

Requirements

1. Build Process: Update Vite config to generate a completely independent build (assets with absolute paths or relative to root).
2. API URL: Frontend must allow dynamic API Endpoint configuration (not hardcoded localhost:3000) to query the backend on the same domain via /api proxy.
3. CORS: Enable CORS on Backend for the frontend domain (if not on the same origin).
4. Standalone: Frontend must not rely on being served by the Backend Express server.

Complexity

5/10 (Requires changes to build, deploy pipeline, and Axios config)