Model catalog

Key features

• Language routes use configure_model_route / list_model_routes.
• Portrait work is on demand for models already registered or selected in the current profile
• Selection is built on the catalog, not a parallel list
• list_model_routes, configure_model_route, and select_default_model manage primary language models through llm-pi-ai.
• Task routes use register_task_model / list_task_models.