feat: add Scrapy, n8n, and Filestash stacks to Falcon

Added three new service stacks to the docker-compose infrastructure:

- **Scrapy stack** (scrapy.pivoine.art):
  - scrapyd: Web scraping daemon with web interface (port 6800)
  - scrapy: Development container for spider commands
  - scrapyrt: Real-time API for running spiders (port 9080)

- **n8n stack** (n8n.pivoine.art):
  - Workflow automation platform with PostgreSQL backend
  - 200+ integrations for automated tasks
  - Runners enabled for task execution
  - Webhook support for external triggers

- **Filestash stack** (stash.pivoine.art):
  - Web-based file manager with multi-backend support
  - Supports SFTP, S3, Dropbox, Google Drive, FTP, WebDAV
  - In-browser file viewing and media playback

Infrastructure updates:
- Updated PostgreSQL init script to create n8n database
- Added environment variables to arty.yml for all three stacks
- Updated compose.yaml include list
- Updated CLAUDE.md and README.md documentation
- Normalized service names in existing stacks (gotify, proxy, umami, vpn)

All services integrated with Traefik for SSL termination and include
Watchtower auto-update labels.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

n8n/compose.yaml

@@ -0,0 +1,52 @@
+services:
+  n8n:
+    image: ${N8N_IMAGE:-docker.n8n.io/n8nio/n8n}
+    container_name: ${N8N_COMPOSE_PROJECT_NAME}_app
+    restart: unless-stopped
+    ports:
+      - "${N8N_PORT:-5678}:5678"
+    volumes:
+      - n8n_data:/home/node/.n8n
+    environment:
+      TZ: ${TIMEZONE:-Europe/Berlin}
+      GENERIC_TIMEZONE: ${TIMEZONE:-Europe/Berlin}
+      N8N_ENFORCE_SETTINGS_FILE_PERMISSIONS: "true"
+      N8N_RUNNERS_ENABLED: "true"
+      DB_TYPE: postgresdb
+      DB_POSTGRESDB_DATABASE: ${N8N_DB_NAME}
+      DB_POSTGRESDB_HOST: ${CORE_DB_HOST}
+      DB_POSTGRESDB_PORT: ${CORE_DB_PORT}
+      DB_POSTGRESDB_USER: ${DB_USER}
+      DB_POSTGRESDB_PASSWORD: ${DB_PASSWORD}
+      DB_POSTGRESDB_SCHEMA: ${N8N_DB_SCHEMA:-public}
+      N8N_HOST: ${N8N_TRAEFIK_HOST}
+      N8N_PORT: 5678
+      N8N_PROTOCOL: https
+      WEBHOOK_URL: https://${N8N_TRAEFIK_HOST}/
+    depends_on:
+      - postgres
+    networks:
+      - compose_network
+    labels:
+      - 'traefik.enable=${N8N_TRAEFIK_ENABLED}'
+      - 'traefik.http.middlewares.${N8N_COMPOSE_PROJECT_NAME}-n8n-redirect-web-secure.redirectscheme.scheme=https'
+      - 'traefik.http.routers.${N8N_COMPOSE_PROJECT_NAME}-n8n-web.middlewares=${N8N_COMPOSE_PROJECT_NAME}-n8n-redirect-web-secure'
+      - 'traefik.http.routers.${N8N_COMPOSE_PROJECT_NAME}-n8n-web.rule=Host(`${N8N_TRAEFIK_HOST}`)'
+      - 'traefik.http.routers.${N8N_COMPOSE_PROJECT_NAME}-n8n-web.entrypoints=web'
+      - 'traefik.http.routers.${N8N_COMPOSE_PROJECT_NAME}-n8n-web-secure.rule=Host(`${N8N_TRAEFIK_HOST}`)'
+      - 'traefik.http.routers.${N8N_COMPOSE_PROJECT_NAME}-n8n-web-secure.tls.certresolver=resolver'
+      - 'traefik.http.routers.${N8N_COMPOSE_PROJECT_NAME}-n8n-web-secure.entrypoints=web-secure'
+      - 'traefik.http.middlewares.${N8N_COMPOSE_PROJECT_NAME}-n8n-web-secure-compress.compress=true'
+      - 'traefik.http.routers.${N8N_COMPOSE_PROJECT_NAME}-n8n-web-secure.middlewares=${N8N_COMPOSE_PROJECT_NAME}-n8n-web-secure-compress'
+      - 'traefik.http.services.${N8N_COMPOSE_PROJECT_NAME}-n8n-web-secure.loadbalancer.server.port=5678'
+      - 'traefik.docker.network=${NETWORK_NAME}'
+      - 'com.centurylinklabs.watchtower.enable=${WATCHTOWER_LABEL_ENABLE}'
+
+volumes:
+  n8n_data:
+    name: ${N8N_COMPOSE_PROJECT_NAME}_n8n_data
+
+networks:
+  compose_network:
+    name: ${NETWORK_NAME}
+    external: true