refactor: add get_item_content_info to AsyncItemService and simplify binary checks

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

src/services/async_item_service.rs

@@ -47,6 +47,18 @@ impl AsyncItemService {
         .unwrap()
     }
 
+    pub async fn get_item_content_info(&self, id: i64) -> Result<(Vec<u8>, String, bool), CoreError> {
+        let db = self.db.clone();
+        let item_service = self.item_service.clone();
+
+        tokio::task::spawn_blocking(move || {
+            let conn = db.blocking_lock();
+            item_service.get_item_content_info(&conn, id)
+        })
+        .await
+        .unwrap()
+    }
+
 
     pub async fn stream_item_content_by_id(
         &self,