fix: complete registration frontend flow

src/services/query/auth.js

@@ -60,10 +60,21 @@ export const useCompleteProfileMutation = () => useMutation({ mutationFn: apiCom
 
 export const useUpdateProfileMutation = () => useMutation({ mutationFn: apiUpdateProfile })
 
+const getRegistrationVideoIfAvailable = async () => {
+  try {
+    return await apiGetRegistrationQuestionVideo()
+  } catch (error) {
+    // The migrated backend does not expose this optional content endpoint yet.
+    // Treat a missing route as "no tutorial uploaded" so registration remains usable.
+    if (error?.response?.status === 404) return {}
+    throw error
+  }
+}
+
 export const useGetRegistrationVideoQuery = (options = {}) =>
   useQuery({
     queryKey: authKeys.registrationVideo(),
-    queryFn: () => apiGetRegistrationQuestionVideo(),
+    queryFn: getRegistrationVideoIfAvailable,
     select: (response) => response?.data ?? response,
     ...options,
   })