fix(cors,n8n): fix CORS for production, add unattended n8n init with seed

- Change CORS_ORIGIN from localhost:4000 to farmacias.hacecalor.net in docker-compose.yml
- Add postgres and parapharmacy-api healthchecks
- Add n8n-init service that runs BEFORE n8n starts:
  - Imports workflows via n8n CLI
  - Activates all workflows via publish:workflow
  - Seeds parapharmacy DB with 20 test products
- Fix parapharmacy-api healthcheck to use node instead of wget (not available in image)
- Fix seed.json to use {products: [...]} format with required source_url field
- Remove activate-workflows.js (replaced by CLI approach)

docker-compose.yml

@@ -10,6 +10,11 @@ services:
       POSTGRES_DB: farmafinder
       POSTGRES_USER: farmafinder
       POSTGRES_PASSWORD: ${PG_PASSWORD:-change-me-in-production}
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U farmafinder"]
+      interval: 5s
+      timeout: 3s
+      retries: 5
     volumes:
       - postgres_data:/var/lib/postgresql/data
 
@@ -156,9 +161,12 @@ services:
       - n8n_data:/home/node/.n8n
       - ./n8n/workflows:/home/node/workflows
     depends_on:
-      - postgres
+      postgres:
+        condition: service_healthy
+      n8n-init:
+        condition: service_completed_successfully
 
-  # --- N8N Init: import workflows, activate, and seed DB ---
+  # --- N8N Init: import + activate workflows BEFORE n8n starts, then seed DB ---
   n8n-init:
     image: n8nio/n8n:latest
     entrypoint: ["/bin/sh", "/home/node/init-import.sh"]
@@ -174,10 +182,9 @@ services:
       - n8n_data:/home/node/.n8n
       - ./n8n/workflows:/home/node/workflows
       - ./n8n/init-import.sh:/home/node/init-import.sh:ro
-      - ./n8n/activate-workflows.js:/home/node/activate-workflows.js:ro
       - ./n8n/seed.json:/home/node/seed.json:ro
     depends_on:
-      n8n:
+      postgres:
         condition: service_healthy
       parapharmacy-api:
         condition: service_healthy