fix: remove unused imports and dead code

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

src/modes/server/api/item.rs

@@ -5,7 +5,6 @@ use axum::{
     http::header,
 };
 use log::warn;
-use serde_json::json;
 use std::collections::HashMap;
 use std::net::SocketAddr;
 use std::path::PathBuf;