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/tests/99-final-verification.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+# Final verification for Lab 04
+echo "Lab 04 Final Verification"
+cd "$(dirname "$0")/.."
+pass=0; fail=0
+check() { if eval "$1"; then echo "✓ $2"; ((pass++)); else echo "✗ $2"; ((fail++)); fi; }
+
+# Infrastructure checks
+check "[[ -f docker-compose.yml ]]" "docker-compose.yml exists"
+check "docker compose config &>/dev/null" "Syntax valid"
+
+# Start services
+docker compose up -d && sleep 8
+
+# Volume checks
+VOLUMES=$(docker volume ls --format '{{.Name}}' | grep -c "lab04" || echo "0")
+check "[[ $VOLUMES -ge 3 ]]" "Named volumes created ($VOLUMES)"
+
+# MinIO checks
+check "curl -sf http://127.0.0.1:9000/minio/health/live" "MinIO API accessible"
+check "curl -sf http://127.0.0.1:9001 &>/dev/null" "MinIO console accessible"
+
+# Persistence check
+docker exec lab04-test sh -c "echo test > /test/file.txt"
+docker compose restart test && sleep 3
+check "docker exec lab04-test cat /test/file.txt | grep -q test" "Data persists after restart"
+
+echo "Passed: $pass, Failed: $fail"
+[[ $fail -eq 0 ]] && exit 0 || exit 1