fix: add missing :name param to groups/is_owner route

The handler expected Path((w_id, name)) but the route was registered
as /is_owner without :name, making the endpoint unreachable.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/tests/groups.rs

@@ -128,6 +128,14 @@ async fn test_group_endpoints(db: Pool<Postgres>) -> anyhow::Result<()> {
         .unwrap();
     assert_eq!(resp.status(), 200);
 
+    // --- is_owner ---
+    let resp = authed(client().get(group_url(port, "is_owner", "test_group")))
+        .send()
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), 200);
+    assert_eq!(resp.json::<bool>().await?, true);
+
     // --- delete ---
     let resp = authed(client().delete(group_url(port, "delete", "another_group")))
         .send()

backend/windmill-api-groups/src/groups.rs

@@ -38,7 +38,7 @@ pub fn workspaced_service() -> Router {
         .route("/delete/:name", delete(delete_group))
         .route("/adduser/:name", post(add_user))
         .route("/removeuser/:name", post(remove_user))
-        .route("/is_owner", get(is_owner))
+        .route("/is_owner/:name", get(is_owner))
 }
 
 pub fn global_service() -> Router {