Update staging configuration to avoid port conflicts and enhance deployment scripts

- Changed staging app port from 3001 to 3002 in docker-compose.staging.yml
- Updated PostgreSQL port from 5433 to 5434 and Redis port from 6380 to 6381
- Modified STAGING_SETUP.md to reflect new port configurations
- Adjusted CI/CD workflows to accommodate new staging ports and improve deployment messages
- Added N8N environment variables to staging configuration for better integration

.github/workflows/ci-cd.yml

@@ -198,7 +198,7 @@ jobs:
           # Wait for health check
           echo "Waiting for staging application to be healthy..."
           for i in {1..30}; do
-            if curl -f http://localhost:3001/api/health > /dev/null 2>&1; then
+            if curl -f http://localhost:3002/api/health > /dev/null 2>&1; then
               echo "✅ Staging deployment successful!"
               break
             fi
@@ -206,7 +206,7 @@ jobs:
           done
           
           # Verify deployment
-          if curl -f http://localhost:3001/api/health; then
+          if curl -f http://localhost:3002/api/health; then
             echo "✅ Staging deployment verified!"
           else
             echo "⚠️ Staging health check failed, but container is running"