refactor: update binary field types and conversions in RPC and protofiles (#2619)

Signed-off-by: 唐小鸭 <tangtang1251@qq.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Co-authored-by: houseme <housemecn@gmail.com>
Co-authored-by: loverustfs <hello@rustfs.com>

crates/ecstore/tests/protobuf_bytes_regression_test.rs

@@ -0,0 +1,36 @@
+// Copyright (c) RustFS contributors
+// SPDX-License-Identifier: Apache-2.0
+
+use bytes::Bytes;
+use rustfs_protos::proto_gen::node_service::{
+    ReadMultipleRequest, ReadMultipleResponse, ReadVersionResponse, ReadXlResponse, UpdateMetadataRequest, WriteMetadataRequest,
+};
+
+fn expect_bytes(_: &Bytes) {}
+
+#[test]
+fn protobuf_bytes_fields_use_bytes_consistently() {
+    let update = UpdateMetadataRequest::default();
+    expect_bytes(&update.file_info_bin);
+    expect_bytes(&update.opts_bin);
+
+    let write = WriteMetadataRequest::default();
+    expect_bytes(&write.file_info_bin);
+
+    let version = ReadVersionResponse::default();
+    expect_bytes(&version.file_info_bin);
+
+    let read_xl = ReadXlResponse::default();
+    expect_bytes(&read_xl.raw_file_info_bin);
+
+    let read_multiple = ReadMultipleRequest::default();
+    expect_bytes(&read_multiple.read_multiple_req_bin);
+
+    let read_multiple_response = ReadMultipleResponse::default();
+    let first = read_multiple_response
+        .read_multiple_resps_bin
+        .first()
+        .cloned()
+        .unwrap_or_default();
+    expect_bytes(&first);
+}