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>

core/postgres/init/01-init-databases.sh

@@ -12,19 +12,24 @@ psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-E
     -- Main application database
     SELECT 'CREATE DATABASE directus'
     WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = 'directus')\gexec
-    
-    -- n8n workflow database
+
+    -- Umami analytics database
     SELECT 'CREATE DATABASE umami'
     WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = 'umami')\gexec
-    
+
+    -- n8n workflow automation database
+    SELECT 'CREATE DATABASE n8n'
+    WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = 'n8n')\gexec
+
     -- Grant privileges to all databases
     GRANT ALL PRIVILEGES ON DATABASE directus TO $POSTGRES_USER;
     GRANT ALL PRIVILEGES ON DATABASE umami TO $POSTGRES_USER;
+    GRANT ALL PRIVILEGES ON DATABASE n8n TO $POSTGRES_USER;
 
     -- Log success
     SELECT 'Compose databases initialized:' AS status;
-    SELECT datname FROM pg_database 
-    WHERE datname IN ('directus', 'umami')
+    SELECT datname FROM pg_database
+    WHERE datname IN ('directus', 'umami', 'n8n')
     ORDER BY datname;
 EOSQL
 
@@ -35,4 +40,5 @@ echo ""
 echo "Databases available:"
 echo "  • directus     - Sexy application database"
 echo "  • umami        - Tracking database"
+echo "  • n8n          - Workflow automation database"
 echo ""