feat: complete n8n stack setup

Docker Compose stack (n8n, PostgreSQL 16, Redis 7, 1 worker) with:
- nginx local proxy on port 8088, YunoHost TLS termination config
- helper scripts: backup/restore/import/export/update
- .env.example, README with architecture, ops commands, to-do list

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

compose/docker-compose.yml

@@ -0,0 +1,118 @@
+name: n8n-stack
+
+services:
+
+  postgres:
+    image: postgres:16-alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: ${POSTGRES_DB}
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+    volumes:
+      - ../data/postgres:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER} -d ${POSTGRES_DB}"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    networks:
+      - n8n-internal
+
+  redis:
+    image: redis:7-alpine
+    restart: unless-stopped
+    command: redis-server --requirepass ${REDIS_PASSWORD}
+    volumes:
+      - ../data/redis:/data
+    healthcheck:
+      test: ["CMD", "redis-cli", "-a", "${REDIS_PASSWORD}", "ping"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    networks:
+      - n8n-internal
+
+  n8n:
+    image: n8nio/n8n:latest
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:5678:5678"
+    environment:
+      # URL & Protokoll
+      N8N_HOST: ${N8N_HOST}
+      N8N_PORT: 5678
+      N8N_PROTOCOL: ${N8N_PROTOCOL}
+      WEBHOOK_URL: ${WEBHOOK_URL}
+      # Datenbank
+      DB_TYPE: postgresdb
+      DB_POSTGRESDB_HOST: postgres
+      DB_POSTGRESDB_PORT: 5432
+      DB_POSTGRESDB_DATABASE: ${POSTGRES_DB}
+      DB_POSTGRESDB_USER: ${POSTGRES_USER}
+      DB_POSTGRESDB_PASSWORD: ${POSTGRES_PASSWORD}
+      # Encryption
+      N8N_ENCRYPTION_KEY: ${N8N_ENCRYPTION_KEY}
+      # Queue / Redis
+      EXECUTIONS_MODE: queue
+      QUEUE_BULL_REDIS_HOST: redis
+      QUEUE_BULL_REDIS_PORT: 6379
+      QUEUE_BULL_REDIS_PASSWORD: ${REDIS_PASSWORD}
+      # SMTP
+      N8N_EMAIL_MODE: smtp
+      N8N_SMTP_HOST: ${SMTP_HOST}
+      N8N_SMTP_PORT: ${SMTP_PORT}
+      N8N_SMTP_USER: ${SMTP_USER}
+      N8N_SMTP_PASS: ${SMTP_PASSWORD}
+      N8N_SMTP_SENDER: ${SMTP_SENDER}
+      N8N_SMTP_SSL: "false"
+      # User Management
+      N8N_USER_MANAGEMENT_DISABLED: "false"
+      # Zeitzone
+      GENERIC_TIMEZONE: ${TZ}
+      TZ: ${TZ}
+    volumes:
+      - ../data/n8n:/home/node/.n8n
+      - ../local-files:/files
+      - ../imports:/imports
+    depends_on:
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    networks:
+      - n8n-internal
+
+  n8n-worker:
+    image: n8nio/n8n:latest
+    restart: unless-stopped
+    command: worker
+    environment:
+      # Datenbank
+      DB_TYPE: postgresdb
+      DB_POSTGRESDB_HOST: postgres
+      DB_POSTGRESDB_PORT: 5432
+      DB_POSTGRESDB_DATABASE: ${POSTGRES_DB}
+      DB_POSTGRESDB_USER: ${POSTGRES_USER}
+      DB_POSTGRESDB_PASSWORD: ${POSTGRES_PASSWORD}
+      # Encryption
+      N8N_ENCRYPTION_KEY: ${N8N_ENCRYPTION_KEY}
+      # Queue / Redis
+      EXECUTIONS_MODE: queue
+      QUEUE_BULL_REDIS_HOST: redis
+      QUEUE_BULL_REDIS_PORT: 6379
+      QUEUE_BULL_REDIS_PASSWORD: ${REDIS_PASSWORD}
+      # Zeitzone
+      GENERIC_TIMEZONE: ${TZ}
+      TZ: ${TZ}
+    volumes:
+      - ../data/n8n:/home/node/.n8n
+      - ../local-files:/files
+    depends_on:
+      - n8n
+    networks:
+      - n8n-internal
+
+networks:
+  n8n-internal:
+    driver: bridge