feat(lab-04): complete Phase 5 - Storage & S3 lab

Phase Plan:
- 05-PLAN.md: Combined execution plan for efficiency
- 05-RESEARCH.md: Domain research on volumes and MinIO

Test Scripts (4):
- 01-volumes-test.sh: Volume persistence verification
- 02-minio-test.sh: MinIO S3 API testing
- 03-persistence-test.sh: Database persistence verification
- 99-final-verification.sh: End-to-end verification

Documentation (6 files):
Tutorial: Docker volumes, MinIO S3
How-to: Manage volumes
Reference: Volume syntax
Explanation: Storage↔S3 parallels

Infrastructure:
- docker-compose.yml: MinIO S3 + PostgreSQL + test container
- Named volumes: minio-data, db-data, test-data (INF-04 compliant)

Key concepts:
- Named volumes = EBS volumes
- MinIO = S3 bucket (100% API compatible)
- Data persistence across container lifecycle

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

labs/lab-04-storage/tutorial/01-docker-volumes.md

@@ -0,0 +1,60 @@
+# Tutorial 1: Docker Volumes - Persistenza dei Dati
+
+## Obiettivi
+- Capire cosa sono i Docker Volumes
+- Creare volumi named
+- Montare volumi nei container
+- Verificare la persistenza dei dati
+
+## Cos'è un Docker Volume?
+
+Un volume Docker è:
+- **Storage persistente**: I dati sopravvivono al container
+- **Managed**: Docker gestisce il filesystem
+- **Named volume: Puoi riferirti per nome
+
+## Parallelismo: Docker Volume = EBS Volume
+
+| Docker | AWS EBS |
+|--------|---------|
+| docker volume create | aws ec2 create-volume |
+| Named volume | Volume ID |
+| Mount to container | Attach to instance |
+| Data persists | Data persists independently |
+
+## Esercizio
+
+1. Crea un volume:
+```bash
+docker volume create my-data
+```
+
+2. Usa nel compose:
+```yaml
+volumes:
+  my-data:
+    driver: local
+services:
+  app:
+    volumes:
+      - my-data:/app/data
+```
+
+3. Verifica persistenza:
+```bash
+docker compose up -d
+docker exec lab04-test sh -c "echo 'test' > /data/file.txt"
+docker compose down
+docker compose up -d
+docker exec lab04-test cat /data/file.txt  # Dato presente!
+```
+
+## Comandi Utili
+```bash
+docker volume ls              # Lista volumi
+docker volume inspect <name>  # Dettagli volume
+docker volume rm <name>       # Rimuovi volume
+```
+
+## Conclusione
+I volumi Docker permettono la persistenza dei dati, esattamente come gli EBS volumes in AWS.