Configure Directus to use MinIO S3 for file storage

- Replace local directus_uploads volume with S3
- Add MinIO credentials to environment config
- Files now stored in s3.b28.dev/directus-uploads
- Enables shared media access across all demos

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.env.example

@@ -17,3 +17,8 @@ DIRECTUS_SECRET=your_directus_secret_here
 # For local: http://localhost:8055
 # For Coolify: https://directus.yourdomain.com
 PUBLIC_URL=http://localhost:8055
+
+# MinIO S3 Storage Configuration
+# These credentials should match your MinIO root user
+MINIO_ACCESS_KEY=your_minio_access_key
+MINIO_SECRET_KEY=your_minio_secret_key