Add Vite dev server integration with backend proxy

[Tim020]

Problem

Currently, the Vite dev server cannot be used for local development because:

• Frontend runs on port 5173 (Vite default)
• Backend runs on port 8080
• No proxy configuration exists to forward API requests from dev server to backend
• This prevents hot reload during development

Proposed Solution

Configure Vite dev server to proxy API requests to the backend server:

// vite.config.js
export default defineConfig({
  // ... existing config
  server: {
    proxy: {
      '/api': {
        target: 'http://localhost:8080',
        changeOrigin: true,
      },
      '/ws': {
        target: 'ws://localhost:8080',
        ws: true,
      },
    },
  },
});

Benefits

• Enable hot module replacement (HMR) during development
• Faster iteration cycles for frontend changes
• Better developer experience

Implementation Notes

• Need to ensure WebSocket connections work through proxy
• Consider adding npm run dev script to package.json
• Update CLAUDE.md with development workflow documentation
• Test authentication flow with proxied requests

Estimated Effort

1-2 hours (config + testing)