fix: resolve lifetime issues and remove unused imports

Co-authored-by: aider (openai/andrew/openrouter/qwen/qwen3-coder) <aider@aider.chat>

src/modes/server/api/item.rs

@@ -10,10 +10,6 @@ use std::collections::HashMap;
 use crate::services::async_item_service::AsyncItemService;
 use crate::services::error::CoreError;
 use crate::modes::server::common::{AppState, ApiResponse, ItemInfo, TagsQuery, ListItemsQuery, ItemInfoListResponse, ItemInfoResponse, MetadataResponse, ItemQuery, ItemContentQuery};
-use crate::common::is_binary::is_binary;
-use tokio::io::{AsyncReadExt, AsyncSeekExt};
-use tokio_util::io::ReaderStream;
-use tokio_util::bytes::Bytes;
 
 #[utoipa::path(
     get,