chore: remove unused imports and variables

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/services/async_item_service.rs

@@ -4,11 +4,8 @@ use crate::services::types::{ItemWithContent, ItemWithMeta};
 use rusqlite::Connection;
 use std::collections::HashMap;
 use std::path::PathBuf;
-use std::str::FromStr;
 use std::sync::Arc;
 use tokio::sync::Mutex;
-use tokio::io::AsyncReadExt;
-use tokio_util::io::ReaderStream;
 
 /// An asynchronous wrapper around the `ItemService` for use in async contexts like the web server.
 /// It uses `tokio::task::spawn_blocking` to run synchronous database and filesystem operations