- Remove custom go-react runner label (was inconsistent on PR branches)
- Replace with ubuntu-latest + manual Go 1.23 / Node 22 install
(actions/setup-go and setup-node don't work with Gitea Act runner)
- Remove duplicate build-dev.yaml workflow (already deleted)
- All steps: Go test → Go build → npm ci → npm lint → npm build
- Docker push on push events only (unchanged)
build-dev.yaml uses actions/setup-go@v5 and actions/setup-node@v4 which
are incompatible with Gitea Act runner (no node20 runtime). dev.yml is
the canonical build workflow; having two competing workflows on the same
triggers was causing duplicate CI runs and misleading failures.
