feat: complete N8N scrapers for 6 sources and seed script

- Create comprehensive N8N workflow for all 6 parapharmacy sources
- Create webhook-triggered manual scraping workflow
- Add seed script with 20 sample products
- Update n8n/README.md with complete documentation
- Update docs/parapharmacy.md with seeding instructions
- Add seed script to package.json

Sources configured:
- Promofarma
- Pharmarket
- DocMorris
- 1001Farma
- Primor
- MiFarma

apps/parapharmacy-api/package.json

@@ -7,6 +7,7 @@
   "scripts": {
     "start": "node --env-file-if-exists=.env src/server.js",
     "dev": "node --env-file-if-exists=.env --watch src/server.js",
+    "seed": "node --env-file-if-exists=.env scripts/seed.js",
     "test": "NODE_OPTIONS='--experimental-vm-modules' npx jest --ci --forceExit --forceExitTimeout=30000"
   },
   "dependencies": {