test(interop): add real MinIO read and migration parity tests (#4377)

test(interop): real-MinIO read + migration parity, Phase 1/2 (backlog#580)

Capture authentic on-disk fixtures from MinIO RELEASE.2025-07-23 (a bucket with
versioning, object-lock, lifecycle, tagging, quota, a public policy, SSE-S3
encryption, a webhook notification target, and a replication rule, plus inline /
versioned / multipart objects and a delete marker) and prove RustFS reads and
migrates them losslessly:

- filemeta parses_real_minio_object_xlmeta: small inline, two-object-version +
  delete marker, and multipart object xl.meta parse to the expected FileInfo.
- ecstore parses_real_minio_bucket_metadata_blob_without_loss: the MinIO
  .metadata.bin msgpack decodes via the PascalCase field names and
  parse_all_configs loads all ten config types present (policy, lifecycle incl.
  <ExpiryUpdatedAt>, object-lock, versioning, tagging, quota, notification,
  encryption/SSE-S3, replication incl. DeleteMarkerReplication /
  ExistingObjectReplication) without loss.
- ecstore reads_minio_inline_bucket_metadata_via_bitrot: MinIO inlines an object
  body as [HighwayHash256 32B][body]; RustFS's BitrotReader with HighwayHash256S
  verifies and yields the exact blob (the "inline_data 前缀不同" is that prefix).
- ecstore migrates_real_minio_bucket_metadata_end_to_end: on a throwaway 4-drive
  local ECStore, a real MinIO .metadata.bin seeded under .minio.sys is migrated
  into .rustfs.sys byte-identically for every config, exercising the Phase 2
  source adapter (MIGRATING_META_BUCKET = ".minio.sys") through the object layer.

All four run as ordinary crate tests (nextest CI). Phase 4 (MinIO re-reading a
RustFS drive) is documented as out of scope for one-way migration.

Refs rustfs/backlog#580

crates/ecstore/tests/fixtures/minio/README.md

@@ -0,0 +1,21 @@
+# Real MinIO on-disk fixtures (backlog#580 interop)
+
+Generated by MinIO `RELEASE.2025-07-23T15-54-02Z` (single-drive, local SSE-S3
+KMS + webhook notify target enabled) writing a bucket configured with
+**versioning, object-lock (GOVERNANCE default), lifecycle, tagging, quota, a
+public-download policy, SSE-S3 encryption, a webhook notification target, and a
+replication rule** (which also seeds a bucket-targets blob), plus inline /
+versioned / multipart objects and a delete marker.
+
+- `bucket_metadata_full.xlmeta.hex` — the `.minio.sys/buckets/interop/.metadata.bin`
+  object (xl.meta wrapper + inline `.metadata.bin` blob).
+- `bucket_metadata.blob.hex` — the raw `.metadata.bin` object body (4-byte
+  `format|version` header + msgpack), carved from the object above.
+
+Unencrypted object `xl.meta` fixtures (clean plaintext sizes) live under
+`crates/filemeta/tests/fixtures/minio/`.
+
+These prove RustFS reads and migrates MinIO-written metadata without loss.
+Not captured here (tooling/scope): CORS, public-access-block, and bucket ACL
+(the SNSD test binary + `mc` did not expose CORS; bucket-targets credentials are
+stored KMS-encrypted and are a documented partial).