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/reference/volume-syntax.md

@@ -0,0 +1,37 @@
+# Reference: Docker Volume Syntax
+
+## Volumes in docker-compose.yml
+
+### Named Volume
+```yaml
+volumes:
+  my-data:
+    driver: local
+```
+
+### Mount Volume in Service
+```yaml
+services:
+  app:
+    volumes:
+      - my-data:/app/data     # Named volume
+      - ./local:/host/path    # Bind mount
+```
+
+### Volume Options
+```yaml
+volumes:
+  data:
+    driver: local
+    driver_opts:
+      type: none
+      o: bind
+      device: /host/path
+```
+
+## CLI Commands
+- `docker volume create`
+- `docker volume ls`
+- `docker volume inspect`
+- `docker volume rm`
+- `docker volume prune`