fix(ui): rewrite all asset paths in index.html with ROOT_PATH (#99)

[rbardaji]

Summary

Fixes #99 — The built React index.html had hardcoded /ui/... asset paths (favicon, JS bundles, CSS, manifest). Behind a reverse proxy with a prefix like /ep-api, the browser requested /ui/static/js/main.xxx.js but the resource was only available at /ep-api/ui/static/js/main.xxx.js.

Changes

• entrypoint.sh: Replaced the specific config.js sed rewrite with a generic one that rewrites all "/ui/ references to "${ROOT_PATH}/ui/ in the built index.html.

Result

All asset paths in index.html now include the ROOT_PATH prefix:

href="/ep-api/ui/favicon.ico"
href="/ep-api/ui/logo192.png"
href="/ep-api/ui/manifest.json"
src="/ep-api/ui/config.js"
src="/ep-api/ui/static/js/main.20709373.js"
href="/ep-api/ui/static/css/main.4159b21f.css"

Test plan

• All 1011 tests pass
• curl localhost:8002/ep-api/ui/ → 200
• curl localhost:8002/ep-api/ui/static/js/main.20709373.js → 200
• curl localhost:8002/ep-api/ui/static/css/main.4159b21f.css → 200
• curl localhost:8002/ep-api/ui/favicon.ico → 200
• curl localhost:8002/ep-api/health → 200