fix(tests): align auth tests with NotAuthenticatedError and 302 redirect

The auth dependency raises NotAuthenticatedError (not HTTPException),
and the exception handler returns a 302 redirect. Updated the unit test
to expect NotAuthenticatedError, and all route auth tests to accept 302
alongside 401/303.

tests/test_schedule_routes.py

@@ -9,4 +9,4 @@ class TestSchedule:
     def test_schedule_requires_auth(self, client: TestClient) -> None:
         """GET /schedule should require admin login."""
         response = client.get("/schedule", follow_redirects=False)
-        assert response.status_code in (401, 303)
+        assert response.status_code in (401, 302, 303)