feat: add MinIO S3 E2E testing support
- Add MinIO service to docker-compose with health checks
- Node & Deno adapters accept optional `blobs` parameter for custom storage
- Test helper uses `minio` client for S3 blob operations
- Set `BLOB_STORAGE=s3` to enable S3 testing via MinIO
- Remove Deno package tsconfigs (excluded from build at root level)
Usage:
PLATFORM=node npm test # filesystem blobs (default)
PLATFORM=node BLOB_STORAGE=s3 npm test # S3 blobs via MinIO
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>