Wire frontend login to user_login.

Co-authored-by: Cursor <cursoragent@cursor.com>

services/apiClient.ts

@@ -159,8 +159,8 @@ const del = (path: string) => request<void>(path, { method: 'DELETE' });
 export const api = {
   auth: {
     csrf: () => get<{ csrfToken: string }>('/auth/csrf/'),
-    login: (user_name: string, password: string) =>
-      post<User>('/auth/login/', { user_name, password }),
+    login: (user_login: string, password: string) =>
+      post<User>('/auth/login/', { user_login, password }),
     logout: () => post<void>('/auth/logout/'),
     me: () => get<User>('/auth/me/'),
   },