fix: resolve compilation errors by adding missing imports and fixing schema definitions

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

src/modes/server/api/item.rs

@@ -11,7 +11,6 @@ use std::path::PathBuf;
 use std::str::FromStr;
 use std::io::Read;
 use anyhow::{Result, anyhow};
-use utoipa::ToSchema;
 
 use crate::compression_engine::{CompressionType, get_compression_engine};
 use crate::db;