Move compose to repo root with context:. (fixes Coolify build-context path)

Coolify runs compose with --project-directory=repo-root, so context:.. resolved above the repo and the build context/Dockerfiles weren't found. Root compose + context:. matches the Dockerfiles' assumption (context = repo root).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docker/docker-compose.yml

@@ -1,58 +0,0 @@
-# Visigine — single-stack compose. Frontend (nginx) is the only ingress;
-# the backend container is reachable only over the internal docker network.
-#
-# Secrets (MISTRAL_KEY, ADMIN_TOKEN) are read from ../server/.env.
-# Deployment vars (NODE_ENV, ALLOWED_ORIGINS, …) are overridden here.
-
-name: visigine
-
-services:
-  backend:
-    build:
-      context: ..
-      dockerfile: docker/backend.Dockerfile
-    # Secrets are injected from Coolify env vars (set them in the Coolify UI).
-    # server/.env is git-ignored and absent in Coolify's clone — so no env_file.
-    environment:
-      NODE_ENV: production
-      PORT: "3001"
-      ALLOWED_ORIGINS: "https://visigine.de"
-      ALLOW_PRIVATE_HOSTS: "0"
-      DB_PATH: "/data/visigine.db"
-      MISTRAL_KEY: ${MISTRAL_KEY}
-      ADMIN_TOKEN: ${ADMIN_TOKEN}
-      OPENAI_KEY: ${OPENAI_KEY:-}
-      PERPLEXITY_KEY: ${PERPLEXITY_KEY:-}
-      ANTHROPIC_KEY: ${ANTHROPIC_KEY:-}
-    expose:
-      - "3001"
-    volumes:
-      # Persist the SQLite file across container rebuilds.
-      - visigine_data:/data
-    restart: unless-stopped
-    networks:
-      - visigine
-
-  frontend:
-    build:
-      context: ..
-      dockerfile: docker/frontend.Dockerfile
-    # No host port binding: on the Coolify server host-port 8080 is already taken
-    # by the Coolify/Traefik proxy. Coolify routes the domain (visigine.de) to
-    # this container's port 80 via Traefik. For local `docker compose` testing,
-    # temporarily add:  ports: ["8090:80"]
-    expose:
-      - "80"
-    depends_on:
-      backend:
-        condition: service_healthy
-    restart: unless-stopped
-    networks:
-      - visigine
-
-networks:
-  visigine:
-    driver: bridge
-
-volumes:
-  visigine_data: