Bug: Docker frontend Dockerfile hardcodes backend hostname — breaks external access

[mrveiss]

Problem

docker/frontend/Dockerfile has build-time args:

ARG VITE_BACKEND_HOST=autobot-backend
ARG VITE_BACKEND_PORT=8000
ARG VITE_HTTP_PROTOCOL=http

These values are baked into the frontend JS bundle at build time. autobot-backend is only resolvable inside the Docker network — when a browser accesses the frontend from outside Docker, API calls to http://autobot-backend:8000 will fail (DNS resolution fails in browser context).

Impact

Medium — frontend works inside Docker network but API calls fail from any external browser. The nginx reverse proxy partially mitigates this by routing /api to the backend, but any direct API URL construction in frontend code will break.

Expected Fix

Frontend should use relative URLs (/api/...) resolved through nginx, not absolute URLs with container hostnames. Build args should default to empty or relative:

ARG VITE_BACKEND_HOST=
ARG VITE_BACKEND_PORT=
ARG VITE_HTTP_PROTOCOL=

Or use runtime config injection via nginx sub_filter or env.js pattern.

Discovered During

Working on #1809 Docker containerization.

[mrveiss]

Fix implemented in PR #1926 (branch fix/docker-bugs-batch). Awaiting merge to Dev_new_gui.

[mrveiss]

Merged in PR #1926 (Docker bugs batch fix).