- Add /api/config endpoint for runtime env var fetching
- Add config.ts service with sync getters (getApiUrl, getBackofficeUrl, etc.)
- Add ConfigContext for React components
- Update api.ts, auth.ts, storage.ts to use runtime config
- Update layout.tsx to wrap app with ConfigProvider
- Fix Dockerfile default port from 8080 to 8521
This allows the frontend to read environment variables at runtime
instead of baking them in during build time.
