fix: cover o1 max-completion token fallback

Maintainer edit: keep the GPT-5/o-series fallback on slug-boundary matching so unrelated model names are not caught by substring checks, and include o1 alongside o3/o4 because it is also an o-series chat model.

tests/providers/test_litellm_kwargs.py

@@ -933,8 +933,12 @@ def test_openai_compat_build_kwargs_uses_gpt5_safe_parameters() -> None:
     ("model_name", "expected_key"),
     [
         ("gpt-5.4", "max_completion_tokens"),
+        ("o1-mini", "max_completion_tokens"),
         ("o3-mini", "max_completion_tokens"),
+        ("o4-mini", "max_completion_tokens"),
         ("gpt-4", "max_tokens"),
+        ("foo3-mini", "max_tokens"),
+        ("foo4-mini", "max_tokens"),
     ],
 )
 def test_openai_compat_build_kwargs_max_completion_tokens_by_model_name(