fix: n8n use hardcoded bind mounts to preserve Portainer data

- n8n app data: /opt/n8n/data → /home/node/.n8n
- postgres data: /opt/n8n/postgres → /var/lib/postgresql/data
  (was using ${N8N_DB_DATA_PATH} which Coolify converts to a named volume)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

n8n/docker-compose.yml

@@ -23,7 +23,6 @@ services:
       NODE_ENV: ${N8N_NODE_ENV}
       N8N_DIAGNOSTICS_ENABLED: ${N8N_DIAGNOSTICS_ENABLED}
 
-      # Correo saliente
       N8N_EMAIL_MODE: ${N8N_EMAIL_MODE}
       N8N_SMTP_HOST: ${N8N_SMTP_HOST}
       N8N_SMTP_PORT: ${N8N_SMTP_PORT}
@@ -33,6 +32,9 @@ services:
       N8N_SMTP_SSL: ${N8N_SMTP_SSL}
       N8N_SMTP_STARTTLS: ${N8N_SMTP_STARTTLS}
 
+    volumes:
+      - /opt/n8n/data:/home/node/.n8n:Z
+
     networks:
       - n8n
       - proxy
@@ -41,6 +43,7 @@ services:
 
   n8n-db:
     image: postgres:16
+    pull_policy: always
     container_name: n8n-pg
     restart: unless-stopped
     environment:
@@ -48,7 +51,7 @@ services:
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
       POSTGRES_DB: ${POSTGRES_DB}
     volumes:
-      - ${N8N_DB_DATA_PATH}:/var/lib/postgresql/data:Z
+      - /opt/n8n/postgres:/var/lib/postgresql/data:Z
     networks:
       - n8n