assistant: pick the preferred model, loaded on demand

The daemon answers with whichever model llama-server has loaded and
never asks for one, so it never evicts a model another client is using.
The Assistant settings page now lists the router's models with their
state. Load saves one as the preferred model, in Prefs, and asks the
router to load it now, polling /v1/models until it reports loaded;
Prefer marks the loaded model as preferred without swapping. The swap
happens only on that click, so the daemon's rule holds.

AGENTS.md records the router's load endpoint and its two refusals, both
measured: it lives on the server root, not under /v1.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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