fix: Resolve type mismatches for Option<FilterChain> and Option<&FilterChain>

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

src/modes/get.rs

@@ -53,7 +53,7 @@ pub fn mode_get(
     let (mut reader, _, _) = item_service.get_item_content_info_streaming_with_chain(
         conn,
         item_id,
-        filter_chain,
+        filter_chain.as_ref(),
     )?;
 
     if detect_binary {
@@ -69,7 +69,7 @@ pub fn mode_get(
         let (new_reader, _, _) = item_service.get_item_content_info_streaming_with_chain(
             conn,
             item_id,
-            filter_chain,
+            filter_chain.as_ref(),
         )?;
         reader = new_reader;
     }

src/services/item_service.rs

@@ -190,7 +190,7 @@ impl ItemService {
             None
         };
         
-        self.get_item_content_info_streaming_with_chain(conn, id, filter_chain)
+        self.get_item_content_info_streaming_with_chain(conn, id, filter_chain.as_ref())
     }
 
     pub fn get_item_content_info_streaming_with_chain(