fix: wire up Ollama Cloud dynamic model discovery in /model TUI picker

provider_model_ids() and list_authenticated_providers() had no case for
"ollama-cloud", so the /model slash command showed 0 models despite
fetch_ollama_cloud_models() being fully implemented. The CLI subcommand
worked because it called fetch_ollama_cloud_models() directly.

- Add ollama-cloud case to provider_model_ids() in models.py
- Populate curated dict for ollama-cloud in list_authenticated_providers()
- Add tests for both code paths

hermes_cli/models.py

@@ -1286,6 +1286,10 @@ def provider_model_ids(provider: Optional[str], *, force_refresh: bool = False)
         live = _fetch_ai_gateway_models()
         if live:
             return live
+    if normalized == "ollama-cloud":
+        live = fetch_ollama_cloud_models(force_refresh=force_refresh)
+        if live:
+            return live
     if normalized == "custom":
         base_url = _get_custom_base_url()
         if base_url: