feat(atlas): per-job CI status + build-injected version in the UI

Phase C: the CI stage now shows the latest run's per-JOB status (Lint/Test,
Build, Deploy, …), each coloured by outcome, from the Gitea /actions/tasks
per-job entries — replacing the static cd.yml job-id list when live.
LatestRunJobs/RunNodes + RunSummary.State aggregate, all test-first.

Version: injected at build via -ldflags from `git describe --tags` (CI checkout
now fetch-depth:0 + --build-arg), served in /api/atlas.json, shown in the header.
No more hand-maintained version label drifting from the git tag.

Verified: build/vet/lint(0)/test green; version ldflag served correctly.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Dockerfile

@@ -5,7 +5,10 @@ RUN go install github.com/a-h/templ/cmd/templ@latest
 COPY go.mod ./
 RUN go mod download
 COPY . .
-RUN templ generate && CGO_ENABLED=0 go build -trimpath -ldflags='-s -w' -o /out/app ./cmd/cad-atlas
+ARG VERSION=dev
+RUN templ generate && CGO_ENABLED=0 go build -trimpath \
+    -ldflags="-s -w -X git.d-ma.be/mathias/cad-atlas/internal/version.Value=${VERSION}" \
+    -o /out/app ./cmd/cad-atlas
 
 FROM gcr.io/distroless/static-debian12:nonroot
 COPY --from=build /out/app /app