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/model_switch.py

@@ -807,6 +807,10 @@ def list_authenticated_providers(
     # "nous" shares OpenRouter's curated list if not separately defined
     if "nous" not in curated:
         curated["nous"] = curated["openrouter"]
+    # Ollama Cloud uses dynamic discovery (no static curated list)
+    if "ollama-cloud" not in curated:
+        from hermes_cli.models import fetch_ollama_cloud_models
+        curated["ollama-cloud"] = fetch_ollama_cloud_models()
 
     # --- 1. Check Hermes-mapped providers ---
     for hermes_id, mdev_id in PROVIDER_TO_MODELS_DEV.items():