feat: add missing delete item endpoint to OpenAPI specification

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

src/modes/server/api/mod.rs

@@ -16,6 +16,7 @@ use utoipa_swagger_ui::SwaggerUi;
         status::handle_status,
         item::handle_list_items,
         item::handle_post_item,
+        item::handle_delete_item,
         item::handle_get_item_latest,
         item::handle_get_item_latest_meta,
         item::handle_get_item_latest_content,