chore: replace all cn comments to en version by volc api (#313)

backend/infra/impl/document/searchstore/milvus/milvus_manager.go

@@ -272,7 +272,7 @@ func (m *milvusManager) convertFields(fields []*searchstore.Field) ([]*mentity.F
 			if f.Type != searchstore.FieldTypeText {
 				return nil, fmt.Errorf("[convertFields] milvus only support text field indexing, field=%s, type=%d", f.Name, f.Type)
 			}
-			// indexing 时只有 content 存储原文
+			// Only content is stored when indexing
 			if f.Name == searchstore.FieldTextContent {
 				resp = append(resp, mentity.NewField().
 					WithName(f.Name).

backend/infra/impl/document/searchstore/vikingdb/vikingdb_searchstore.go

@@ -112,7 +112,7 @@ func (v *vkSearchStore) Retrieve(ctx context.Context, query string, opts ...retr
 		return nil, fmt.Errorf("[Retrieve] vikingdb failed to build filter, %w", err)
 	}
 	if filter != nil {
-		// 不支持跨 partition 召回，使用 filter 替代
+		// Cross-partition recall is not supported, use filter instead
 		searchOpts = searchOpts.SetFilter(filter)
 	}