Refactor: Fix clippy warnings and introduce AppError

server/src/vector_db.rs

@@ -3,7 +3,7 @@ use qdrant_client::Qdrant;
 use std::sync::Arc;
 use std::error::Error;
 use uuid::Uuid;
-use tracing::{info, error};
+use tracing::info;
 use serde::{Deserialize, Serialize};
 
 #[derive(Clone)]