fix(nginx): generate nginx.conf dynamically with ROOT_PATH (#97)

[rbardaji]

Summary

Fixes #97 — The nginx configuration inside the all-in-one container had hardcoded location paths (/ui/, /api/, /). When deployed behind a reverse proxy that forwards prefixed paths (e.g., /ep-api/ui/...), nginx returned 404.

Changes

• entrypoint.sh: Now generates /etc/nginx/sites-available/default at startup using ROOT_PATH as prefix for all locations. Also updates the config.js script path in the built index.html.

How it works

When ROOT_PATH=/ep-api, the generated nginx.conf has:

• location /ep-api/ui/ → serves static UI files
• location /ep-api/api/ → proxies to uvicorn (strips prefix)
• location /ep-api/ → proxies to uvicorn (strips prefix)

When ROOT_PATH is empty, locations are /ui/, /api/, / — identical to the previous static config.

Test plan

• All 1011 tests pass
• curl localhost:8002/ep-api/ui/ → 200
• curl localhost:8002/ep-api/health → 200
• curl localhost:8002/ep-api/ui/config.js → 200
• Generated nginx.conf has correct prefixed locations
• Built index.html loads config.js from /ep-api/ui/config.js