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/02-minio-s3.md

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+# Tutorial 2: MinIO - Storage S3-Compatible
+
+## Obiettivi
+- Capire cosa è MinIO
+- Deploy MinIO con Docker Compose
+- Usare S3 API localmente
+- Configurare client S3
+
+## Cos'è MinIO?
+
+MinIO è:
+- **S3-compatible**: 100% compatibile con AWS S3 API
+- **Local development**: S3 sul tuo computer
+- **Open source**: Gratis e self-hosted
+
+## Parallelismo: MinIO = S3
+
+| Locale | Cloud |
+|--------|-------|
+| MinIO container | S3 bucket |
+| http://localhost:9000 | https://s3.amazonaws.com |
+| mc ls | aws s3 ls |
+| minioadmin | AWS credentials |
+
+## Configurazione
+
+```yaml
+minio:
+  image: minio/minio:latest
+  command: server /data --console-address ":9001"
+  environment:
+    MINIO_ROOT_USER: minioadmin
+    MINIO_ROOT_PASSWORD: minioadmin123
+  ports:
+    - "9000:9000"  # API
+    - "9001:9001"  # Console
+  volumes:
+    - minio-data:/data
+```
+
+## Utilizzo
+
+### Accesso Console
+Apri: http://localhost:9001
+Login: minioadmin / minioadmin123
+
+### AWS CLI
+```bash
+aws s3 ls --endpoint-url http://localhost:9000
+aws s3 mb s3://testbucket --endpoint-url http://localhost:9000
+aws s3 cp file.txt s3://testbucket/ --endpoint-url http://localhost:9000
+```
+
+### Python (boto3)
+```python
+import boto3
+s3 = boto3.client('s3', endpoint_url='http://localhost:9000',
+                  aws_access_key_id='minioadmin',
+                  aws_secret_access_key='minioadmin123')
+s3.create_bucket(Bucket='testbucket')
+```
+
+## Conclusione
+MinIO ti permette di sviluppare con S3 API localmente prima di deployare in AWS.