Migrate CI to single-step DinD with Fabio/Consul

Replace 5-step pipeline (build/test/push/push/deploy) with single
docker:dind step that builds and deploys in-place via Docker socket.

- .woodpecker.yml: single-step DinD, 1 secret (SECRET_KEY)
- docker-compose.fabio.yml: overlay with SERVICE_* labels for Registrator
- docker-compose.yml: add ports without host bind (Fabio/Traefik routing)
- docker-compose.dev.yml: named volumes with bind driver
- Dockerfiles: install curl, HEALTHCHECK via curl /api/health
- Makefile: docker-fabio, consul-services, fabio-routes targets

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker/frontend.Dockerfile

@@ -21,6 +21,9 @@ FROM base AS production
 ENV PORT=3000
 ENV NODE_ENV=production
 
+RUN apt-get update && apt-get install -y --no-install-recommends curl \
+    && rm -rf /var/lib/apt/lists/*
+
 COPY --from=build /src/.output /src/.output
 
 HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \