Remove static JSON files and seed step; migrate site settings to Postgres

All content (recipes + imprint/privacy settings) now lives exclusively in
Postgres. The app no longer requires a seed step on first deploy.

Changes:
- helpers.php: load_site_settings() returns defaults when site_settings
  table is empty instead of throwing DatabaseUnavailableException; removes
  legacy JSONB migration path
- data/recipes.json, data/site.json: deleted (content already in DB)
- scripts/db-seed.php: deleted (no longer needed)
- docker-compose.yml: remove RUN_DB_SEED env var and data/ volume mount
- docker/entrypoint.sh: remove RUN_DB_SEED seed block
- docs/COOLIFY.md: update deployment guide to reflect seedless workflow
- .claude/launch.json: add dev server configurations for preview tool

Fresh deploys now start with placeholder legal pages and an empty recipe
list; the admin fills in real content via /admin.php without any CLI step.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -3,28 +3,23 @@
 #   docker compose build
 #   docker compose up -d
 #   curl http://127.0.0.1:8080/health.php
-#
-# Erstes Deployment mit Seed:
-#   RUN_DB_SEED=true docker compose up -d
 
 services:
   web:
     build: .
+    restart: unless-stopped
     ports:
       - "8080:80"
     environment:
       DATABASE_URL: postgresql://flixcooks:flixcooks_prod@postgres:5432/flixcooks
       FLIXCOOKS_ADMIN_KEY: ${FLIXCOOKS_ADMIN_KEY:-change-me-in-production}
-      RUN_DB_SEED: ${RUN_DB_SEED:-false}
     depends_on:
       postgres:
         condition: service_healthy
-    volumes:
-      # Impressum/Datenschutz-Einstellungen persistent halten
-      - site_data:/var/www/html/data
 
   postgres:
     image: postgres:16-alpine
+    restart: unless-stopped
     environment:
       POSTGRES_USER: flixcooks
       POSTGRES_PASSWORD: flixcooks_prod
@@ -39,4 +34,3 @@ services:
 
 volumes:
   pg_data:
-  site_data: