feat: add Coolify deployment platform to dev stack

Add Coolify self-hosted deployment platform with:
- Coolify main service at coolify.dev.pivoine.art
- Dedicated PostgreSQL database (uses shared core instance)
- Soketi WebSocket server for real-time features
- Traefik routing with HTTPS and compression
- Environment variables in arty.yml (secrets in .env)
- Database creation in PostgreSQL init script

Coolify enables deploying applications from Git repositories,
including the pivoine.art Jekyll site from Gitea.

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

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

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

@@ -45,6 +45,10 @@ psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-E
     SELECT 'CREATE DATABASE gitea'
     WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = 'gitea')\\gexec
 
+    -- Coolify deployment platform database
+    SELECT 'CREATE DATABASE coolify'
+    WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = 'coolify')\\gexec
+
     -- Grant privileges to all databases
     GRANT ALL PRIVILEGES ON DATABASE directus TO $POSTGRES_USER;
     GRANT ALL PRIVILEGES ON DATABASE umami TO $POSTGRES_USER;
@@ -54,11 +58,13 @@ psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-E
     GRANT ALL PRIVILEGES ON DATABASE mattermost TO $POSTGRES_USER;
     GRANT ALL PRIVILEGES ON DATABASE tandoor TO $POSTGRES_USER;
     GRANT ALL PRIVILEGES ON DATABASE asciinema TO $POSTGRES_USER;
+    GRANT ALL PRIVILEGES ON DATABASE gitea TO $POSTGRES_USER;
+    GRANT ALL PRIVILEGES ON DATABASE coolify TO $POSTGRES_USER;
 
     -- Log success
     SELECT 'Compose databases initialized:' AS status;
     SELECT datname FROM pg_database
-    WHERE datname IN ('directus', 'umami', 'n8n', 'linkwarden', 'joplin', 'mattermost', 'tandoor', 'asciinema')
+    WHERE datname IN ('directus', 'umami', 'n8n', 'linkwarden', 'joplin', 'mattermost', 'tandoor', 'asciinema', 'gitea', 'coolify')
     ORDER BY datname;
 EOSQL
 
@@ -75,4 +81,6 @@ echo "  • joplin       - Note-taking server database"
 echo "  • mattermost   - Chat platform database"
 echo "  • tandoor      - Recipe manager database"
 echo "  • asciinema    - Terminal recording server database"
+echo "  • gitea        - Self-hosted Git service database"
+echo "  • coolify      - Deployment platform database"
 echo ""