feat: add Tandoor recipe manager to infrastructure

Added Tandoor Recipes as a comprehensive recipe management solution:

**Tandoor Stack** (tandoor.pivoine.art):
- Modern recipe manager with smart scaling and collaboration
- PostgreSQL backend for recipe persistence
- Email notifications via IONOS SMTP
- Static and media file storage in dedicated volumes
- User signups disabled (admin-only access)

**Features:**
- Smart recipe scaling (auto-adjust ingredients for servings)
- Spaces for collaboration (family/roommate recipe sharing)
- Meal planning and shopping lists
- Recipe import from URLs
- Mobile app support (Kitshn app)
- Nutritional information and pricing

**Infrastructure updates:**
- Added tandoor database to PostgreSQL init script
- Added environment variables to arty.yml
- Updated compose.yaml include list
- Added Tandoor volumes (staticfiles, mediafiles) to Restic backup
- Configured email notifications for invitations and notifications

**Tech stack:**
- Django/Python backend
- Vue.js frontend
- PostgreSQL database (shared core instance)
- Gunicorn WSGI server

Tandoor provides superior UX compared to Mealie with better recipe
scaling, collaboration features, and mobile app experience.

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

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

tandoor/compose.yaml

@@ -0,0 +1,78 @@
+services:
+  tandoor:
+    image: ${TANDOOR_IMAGE:-vabene1111/recipes:latest}
+    container_name: ${TANDOOR_COMPOSE_PROJECT_NAME}_app
+    restart: unless-stopped
+    environment:
+      # Django settings
+      SECRET_KEY: ${TANDOOR_SECRET_KEY}
+      ALLOWED_HOSTS: ${TANDOOR_TRAEFIK_HOST}
+      TIMEZONE: ${TIMEZONE:-Europe/Berlin}
+
+      # Database configuration
+      DB_ENGINE: django.db.backends.postgresql
+      POSTGRES_HOST: ${CORE_DB_HOST}
+      POSTGRES_PORT: ${CORE_DB_PORT}
+      POSTGRES_USER: ${DB_USER}
+      POSTGRES_PASSWORD: ${DB_PASSWORD}
+      POSTGRES_DB: ${TANDOOR_DB_NAME}
+
+      # Application settings
+      ENABLE_SIGNUP: ${TANDOOR_ENABLE_SIGNUP:-0}
+      REVERSE_PROXY_AUTH: ${TANDOOR_REVERSE_PROXY_AUTH:-0}
+
+      # Email configuration (IONOS SMTP)
+      EMAIL_HOST: ${EMAIL_SMTP_HOST}
+      EMAIL_PORT: ${EMAIL_SMTP_PORT}
+      EMAIL_HOST_USER: ${EMAIL_SMTP_USER}
+      EMAIL_HOST_PASSWORD: ${EMAIL_SMTP_PASSWORD}
+      EMAIL_USE_TLS: ${TANDOOR_EMAIL_USE_TLS:-0}
+      EMAIL_USE_SSL: ${TANDOOR_EMAIL_USE_SSL:-1}
+      DEFAULT_FROM_EMAIL: ${EMAIL_FROM}
+
+      # Gunicorn settings
+      GUNICORN_MEDIA: ${TANDOOR_GUNICORN_MEDIA:-0}
+
+      # Optional features
+      COMMENT_PREF_DEFAULT: ${TANDOOR_COMMENT_PREF_DEFAULT:-1}
+      SHOPPING_MIN_AUTOSYNC_INTERVAL: ${TANDOOR_SHOPPING_MIN_AUTOSYNC_INTERVAL:-5}
+
+    volumes:
+      - tandoor_staticfiles:/opt/recipes/staticfiles
+      - tandoor_mediafiles:/opt/recipes/mediafiles
+
+    depends_on:
+      - postgres
+
+    networks:
+      - compose_network
+
+    labels:
+      - 'traefik.enable=${TANDOOR_TRAEFIK_ENABLED}'
+      # HTTP to HTTPS redirect
+      - 'traefik.http.middlewares.${TANDOOR_COMPOSE_PROJECT_NAME}-redirect-web-secure.redirectscheme.scheme=https'
+      - 'traefik.http.routers.${TANDOOR_COMPOSE_PROJECT_NAME}-web.middlewares=${TANDOOR_COMPOSE_PROJECT_NAME}-redirect-web-secure'
+      - 'traefik.http.routers.${TANDOOR_COMPOSE_PROJECT_NAME}-web.rule=Host(`${TANDOOR_TRAEFIK_HOST}`)'
+      - 'traefik.http.routers.${TANDOOR_COMPOSE_PROJECT_NAME}-web.entrypoints=web'
+      # HTTPS router
+      - 'traefik.http.routers.${TANDOOR_COMPOSE_PROJECT_NAME}-web-secure.rule=Host(`${TANDOOR_TRAEFIK_HOST}`)'
+      - 'traefik.http.routers.${TANDOOR_COMPOSE_PROJECT_NAME}-web-secure.tls.certresolver=resolver'
+      - 'traefik.http.routers.${TANDOOR_COMPOSE_PROJECT_NAME}-web-secure.entrypoints=web-secure'
+      - 'traefik.http.middlewares.${TANDOOR_COMPOSE_PROJECT_NAME}-web-secure-compress.compress=true'
+      - 'traefik.http.routers.${TANDOOR_COMPOSE_PROJECT_NAME}-web-secure.middlewares=${TANDOOR_COMPOSE_PROJECT_NAME}-web-secure-compress,security-headers@file'
+      # Service
+      - 'traefik.http.services.${TANDOOR_COMPOSE_PROJECT_NAME}-web-secure.loadbalancer.server.port=8080'
+      - 'traefik.docker.network=${NETWORK_NAME}'
+      # Watchtower
+      - 'com.centurylinklabs.watchtower.enable=${WATCHTOWER_LABEL_ENABLE}'
+
+volumes:
+  tandoor_staticfiles:
+    name: ${TANDOOR_COMPOSE_PROJECT_NAME}_staticfiles
+  tandoor_mediafiles:
+    name: ${TANDOOR_COMPOSE_PROJECT_NAME}_mediafiles
+
+networks:
+  compose_network:
+    name: ${NETWORK_NAME}
+    external: true