[chengyongru]

Summary

• use the gateway-provided WebSocket URL to preserve its custom port while running the WebUI through Vite
• add a focused regression test for a custom gateway target

Why

With NANOBOT_API_URL=http://127.0.0.1:<port> bun run dev, Vite proxied HTTP requests to the configured gateway, but the app WebSocket still connected to hard-coded port 8765. The WebUI therefore stayed disconnected whenever the gateway used another port.

Verification

• cd webui && bun run test -- src/tests/bootstrap.test.ts — 8 passed
• cd webui && bun run lint
• cd webui && bun run build
• black-box check with a real gateway on custom WebSocket port 52913 and Vite on 5173:
  • the page reported Connected
  • the browser established its WebSocket connection to 52913
  • the Vite client was present
  • browser console: 0 errors, 0 warnings