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>

.woodpecker.yml

@@ -3,61 +3,20 @@ when:
   event: push
 
 steps:
-  build-frontend:
-    image: node:20-slim
+  - name: build
+    image: docker:dind
+    environment:
+      COMPOSE_PROJECT_NAME: ${CI_REPO_OWNER,,}-${CI_REPO_NAME,,}-${CI_COMMIT_BRANCH//\//-}
+      DOMAIN: sejeteralo.org
+      LETSENCRYPT_HOST: sejeteralo.org
+      SERVICE_8000_TAGS: urlprefix-sejeteralo.org:443/api
+      SERVICE_3000_TAGS: urlprefix-sejeteralo.org:443/*
+      SECRET_KEY:
+        from_secret: SECRET_KEY
     commands:
-      - cd frontend && npm ci && npm run build
-
-  build-backend:
-    image: python:3.11-slim
-    commands:
-      - pip install -r backend/requirements.txt
-      - cd backend && python -m pytest tests/ -v --tb=short || true
-
-  docker-backend:
-    image: woodpeckerci/plugin-docker-buildx
-    settings:
-      repo:
-        from_secret: registry_repo_backend
-      registry:
-        from_secret: registry_host
-      username:
-        from_secret: registry_user
-      password:
-        from_secret: registry_password
-      dockerfile: docker/backend.Dockerfile
-      target: production
-      tags: latest
+      - docker compose -f docker/docker-compose.yml -f docker/docker-compose.fabio.yml up --build -d
+    volumes:
+      - ${DOCKER_SOCKET_LOCATION:-/var/run/docker.sock}:/var/run/docker.sock
     when:
-      status: success
-
-  docker-frontend:
-    image: woodpeckerci/plugin-docker-buildx
-    settings:
-      repo:
-        from_secret: registry_repo_frontend
-      registry:
-        from_secret: registry_host
-      username:
-        from_secret: registry_user
-      password:
-        from_secret: registry_password
-      dockerfile: docker/frontend.Dockerfile
-      target: production
-      tags: latest
-    when:
-      status: success
-
-  deploy:
-    image: appleboy/drone-ssh
-    settings:
-      host:
-        from_secret: deploy_host
-      username:
-        from_secret: deploy_user
-      key:
-        from_secret: deploy_key
-      script:
-        - cd /opt/sejeteralo && docker compose -f docker/docker-compose.yml pull && docker compose -f docker/docker-compose.yml up -d
-    when:
-      status: success
+      - branch: main
+        event: push