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>

stash/compose.yaml

@@ -0,0 +1,38 @@
+services:
+  filestash:
+    image: ${STASH_IMAGE:-machines/filestash:latest}
+    container_name: ${STASH_COMPOSE_PROJECT_NAME}_app
+    restart: unless-stopped
+    ports:
+      - "${STASH_PORT:-8334}:8334"
+    volumes:
+      - filestash_data:/app/data/state/
+    environment:
+      TZ: ${TIMEZONE:-Europe/Berlin}
+      APPLICATION_URL: https://${STASH_TRAEFIK_HOST}
+      CANARY: ${STASH_CANARY:-true}
+    networks:
+      - compose_network
+    labels:
+      - 'traefik.enable=${STASH_TRAEFIK_ENABLED}'
+      - 'traefik.http.middlewares.${STASH_COMPOSE_PROJECT_NAME}-filestash-redirect-web-secure.redirectscheme.scheme=https'
+      - 'traefik.http.routers.${STASH_COMPOSE_PROJECT_NAME}-filestash-web.middlewares=${STASH_COMPOSE_PROJECT_NAME}-filestash-redirect-web-secure'
+      - 'traefik.http.routers.${STASH_COMPOSE_PROJECT_NAME}-filestash-web.rule=Host(`${STASH_TRAEFIK_HOST}`)'
+      - 'traefik.http.routers.${STASH_COMPOSE_PROJECT_NAME}-filestash-web.entrypoints=web'
+      - 'traefik.http.routers.${STASH_COMPOSE_PROJECT_NAME}-filestash-web-secure.rule=Host(`${STASH_TRAEFIK_HOST}`)'
+      - 'traefik.http.routers.${STASH_COMPOSE_PROJECT_NAME}-filestash-web-secure.tls.certresolver=resolver'
+      - 'traefik.http.routers.${STASH_COMPOSE_PROJECT_NAME}-filestash-web-secure.entrypoints=web-secure'
+      - 'traefik.http.middlewares.${STASH_COMPOSE_PROJECT_NAME}-filestash-web-secure-compress.compress=true'
+      - 'traefik.http.routers.${STASH_COMPOSE_PROJECT_NAME}-filestash-web-secure.middlewares=${STASH_COMPOSE_PROJECT_NAME}-filestash-web-secure-compress'
+      - 'traefik.http.services.${STASH_COMPOSE_PROJECT_NAME}-filestash-web-secure.loadbalancer.server.port=8334'
+      - 'traefik.docker.network=${NETWORK_NAME}'
+      - 'com.centurylinklabs.watchtower.enable=${WATCHTOWER_LABEL_ENABLE}'
+
+volumes:
+  filestash_data:
+    name: ${STASH_COMPOSE_PROJECT_NAME}_filestash_data
+
+networks:
+  compose_network:
+    name: ${NETWORK_NAME}
+    external: true