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/docker-compose.yml

@@ -0,0 +1,82 @@
+# Lab 04: Storage & S3 - Docker Compose Configuration
+# Simula storage S3-compatible con MinIO e Docker Volumes
+
+version: "3.8"
+
+services:
+  # MinIO - S3-compatible object storage
+  minio:
+    image: minio/minio:latest
+    container_name: lab04-minio
+    hostname: minio
+
+    command: server /data --console-address ":9001"
+
+    environment:
+      MINIO_ROOT_USER: minioadmin
+      MINIO_ROOT_PASSWORD: minioadmin123
+
+    deploy:
+      resources:
+        limits:
+          cpus: '1'
+          memory: 1G
+
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:9000/minio/health/live"]
+      interval: 15s
+      timeout: 5s
+      retries: 3
+
+    ports:
+      - "127.0.0.1:9000:9000"  # API S3
+      - "127.0.0.1:9001:9001"  # Console UI
+
+    volumes:
+      - minio-data:/data
+
+    restart: unless-stopped
+
+  # PostgreSQL con volume persistente
+  db:
+    image: postgres:16-alpine
+    container_name: lab04-db
+    hostname: db
+
+    environment:
+      POSTGRES_DB: lab04_db
+      POSTGRES_USER: lab04_user
+      POSTGRES_PASSWORD: lab04_password
+
+    deploy:
+      resources:
+        limits:
+          cpus: '1'
+          memory: 1G
+
+    volumes:
+      - db-data:/var/lib/postgresql/data
+
+    restart: unless-stopped
+
+  # Test container - verifica persistenza
+  test:
+    image: alpine:3.19
+    container_name: lab04-test
+    hostname: test
+
+    command: ["sh", "-c", "sleep 3600"]
+
+    volumes:
+      - test-data:/test
+
+    restart: unless-stopped
+
+# Named Volumes - Persistono oltre la vita dei container
+volumes:
+  minio-data:
+    driver: local
+  db-data:
+    driver: local
+  test-data:
+    driver: local