Add production deployment config, Alembic migration, switch to Haiku

- Production Docker Compose with Caddy reverse proxy, Gunicorn, Nginx
- Multi-stage frontend build for production
- Deploy script and automated database backup script
- Initial Alembic migration with all tables
- Switch recommendation model from Sonnet to Haiku for cost efficiency

backend/app/services/recommender.py

@@ -135,7 +135,7 @@ Return ONLY the JSON array, no other text."""
     # Call Claude API
     client = anthropic.Anthropic(api_key=settings.ANTHROPIC_API_KEY)
     message = client.messages.create(
-        model="claude-sonnet-4-20250514",
+        model="claude-haiku-4-5-20251001",
         max_tokens=2000,
         messages=[{"role": "user", "content": prompt}],
     )