fix(client): configure proper routing for SPA
- Add historyApiFallback to Vite dev server configuration
- Add preview server configuration with historyApiFallback
- Create nginx.conf with try_files directive for client-side routing
- Update Dockerfile to use custom nginx configuration
- Fix page reload issues on client-side routes like /profile and /job-experience
This ensures that when users reload the page on any route, they get the correct page instead of a 404 error.