fix: remove unused imports and add comment for error handling

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

src/modes/server/api/item.rs

@@ -4,10 +4,8 @@ use axum::{
     response::{Json, Response},
     http::header,
 };
-use tokio::io::{AsyncReadExt, AsyncSeekExt};
 use log::warn;
 use std::collections::HashMap;
-use anyhow;
 
 use crate::services::async_item_service::AsyncItemService;
 use crate::services::error::CoreError;
@@ -252,6 +250,7 @@ pub async fn handle_get_item_content(
             Ok(response)
         }
         Err(e) => {
+            // Check if the error is ItemNotFound to return 404
             if let Some(core_err) = e.downcast_ref::<CoreError>() {
                 if matches!(core_err, CoreError::ItemNotFound(_)) {
                     return Err(StatusCode::NOT_FOUND);