Update epic checklist, mark completed tasks, fix Gitea username/domain
references, and update DEPLOYMENT.md with correct registry paths.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Backend: installs non-editable, runs uvicorn without reload.
Frontend: multi-stage build, serves static files via nginx with
API proxy to the backend service and SPA fallback routing.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>