feat(models): add paid tencent/hy3-preview route on OpenRouter (#21077)

Add tencent/hy3-preview (without :free suffix) as a paid model route
alongside the existing free variant. This allows seamless transition
when the model moves from free to paid on OpenRouter — both routes
coexist so neither side's timing causes breakage.

Changes:
- models.py: add ("tencent/hy3-preview", "") to OPENROUTER_MODELS
- model-catalog.json: add paid variant entry
- tests: add assertions for paid route presence

The :free entry can be removed in a follow-up PR once OpenRouter
confirms the free route is deprecated.

Co-authored-by: simonweng <simonweng@tencent.com>

hermes_cli/models.py

@@ -46,6 +46,7 @@ OPENROUTER_MODELS: list[tuple[str, str]] = [
     ("xiaomi/mimo-v2.5-pro",             ""),
     ("xiaomi/mimo-v2.5",                 ""),
     ("tencent/hy3-preview:free",         "free"),
+    ("tencent/hy3-preview",              ""),
     ("openai/gpt-5.3-codex",            ""),
     ("google/gemini-3-pro-image-preview", ""),
     ("google/gemini-3-flash-preview",   ""),