fix: proxy /api/* from Vite dev server to the backend

[constk]

Summary

Hello page at http://localhost:5173 was rendering the error state with Unexpected token '<', "<!doctype "... is not valid JSON because the Vite dev server has no route for /api/v1/* and falls back to serving index.html.

Fix

frontend/vite.config.ts — add server.proxy forwarding /api/* to the backend. Target defaults to http://localhost:8000 for host-mode dev; overridable via VITE_API_PROXY_TARGET so docker-compose points at http://app:8000 (the in-network backend hostname).

docker-compose.yml — set VITE_API_PROXY_TARGET=http://app:8000 on the frontend service.

Test plan

• npm run check clean
• npm run lint clean
• npm run format:check clean
• npm run test (2 passed)
• npm run build clean
• Live: restart npm run dev, hit http://localhost:5173, the page should now render the green OK v0.0.0+local badge.

🤖 Generated with Claude Code