chore: cargo fmt — settle formatting drift blocking the release gate

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

core/archipelago/src/api/handler/mod.rs

@@ -207,7 +207,11 @@ impl ApiHandler {
                 hyper::Body::from(r#"{"error":"invalid backup id"}"#),
             ));
         }
-        let file = self.config.data_dir.join("backups").join(format!("{id}.bak"));
+        let file = self
+            .config
+            .data_dir
+            .join("backups")
+            .join(format!("{id}.bak"));
         match tokio::fs::read(&file).await {
             Ok(bytes) => Ok(Response::builder()
                 .status(StatusCode::OK)