refactor: extract content info logic to item_service

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

src/services/item_service.rs

@@ -66,6 +66,25 @@ impl ItemService {
         })
     }
 
+    pub fn get_item_content_info(&self, conn: &Connection, id: i64) -> Result<(Vec<u8>, String, bool), CoreError> {
+        let item_with_content = self.get_item_content(conn, id)?;
+        let metadata = item_with_content.item_with_meta.meta_as_map();
+        
+        let mime_type = metadata
+            .get("mime_type")
+            .map(|s| s.to_string())
+            .unwrap_or_else(|| "application/octet-stream".to_string());
+        
+        // Check if content is binary
+        let is_binary = if let Some(binary_val) = metadata.get("binary") {
+            binary_val == "true"
+        } else {
+            crate::common::is_binary::is_binary(&item_with_content.content)
+        };
+        
+        Ok((item_with_content.content, mime_type, is_binary))
+    }
+
     pub fn find_item(&self, conn: &Connection, ids: &[i64], tags: &[String], meta: &HashMap<String, String>) -> Result<ItemWithMeta, CoreError> {
         debug!("ITEM_SERVICE: Finding item with ids: {:?}, tags: {:?}, meta: {:?}", ids, tags, meta);
         let item_maybe = match (ids.is_empty(), tags.is_empty() && meta.is_empty()) {