fix(models): merge live API results with curated static catalog in generic provider path

When a provider's live /v1/models endpoint returns a stale or incomplete
list (e.g. Z.AI missing glm-5.2), the generic profile-based code path
returned only the live results, silently dropping curated models.

Generalize the kimi-coding merge pattern to all providers: live entries
come first (provider's preferred order), then curated-only entries are
appended with case-insensitive dedup. This ensures models that the live
endpoint omits still appear in /model picker.

Fixes #46850

tests/hermes_cli/test_models_dev_preferred_merge.py

@@ -114,7 +114,8 @@ class TestProviderModelIdsPreferred:
             patch("providers.base.ProviderProfile.fetch_models", return_value=["kimi-k2.6"]),
         ):
             out = provider_model_ids("kimi-coding")
-        assert out[:2] == ["kimi-k2.7-code", "kimi-k2.6"]
+        # Live-first order; curated-only (k2.7-code) appended after live
+        assert out[:2] == ["kimi-k2.6", "kimi-k2.7-code"]
 
     def test_kimi_setup_flow_uses_same_coding_plan_catalog(self):
         """The setup wizard must not carry a stale duplicate Kimi model list."""