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/how-to-guides/manage-volumes.md

@@ -0,0 +1,29 @@
+# How-to: Gestire Docker Volumes
+
+## Creare Volume
+```bash
+docker volume create my-volume
+```
+
+## Ispezionare Volume
+```bash
+docker volume inspect my-volume
+```
+
+## Liste Volumi
+```bash
+docker volume ls
+docker volume ls --filter "name=lab04*"
+```
+
+## Backup Volume
+```bash
+docker run --rm -v my-volume:/data -v $(pwd):/backup \
+  alpine tar czf /backup/backup.tar.gz /data
+```
+
+## Rimuovere Volume
+```bash
+docker volume rm my-volume
+# Cautela: perde tutti i dati!
+```