fix: Add scipy dependency and fix config for Docker deployment

- Add scipy==1.11.4 for A/B testing statistical analysis
- Add SMTP config fields and extra="ignore" to Settings
- Remove obsolete 'version' attribute from docker-compose.yml

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 services:
   # ===========================================
   # APLICACIÓN PRINCIPAL (FastAPI)