fix: Nous static models use @nous: prefix — v0.50.164 (#885)
Follow-up to #854 / PR #870. The previous fix made Nous static IDs
slash-prefixed and added a portal-guard branch to resolve_model_provider().
This tightens the static list to use the explicit @nous: prefix, matching
the format of live-fetched models after ui.js's _fetchLiveModels() portal-
prefix step.
The @provider:model branch in resolve_model_provider() is more explicit and
reliable than the portal-guard fallback. Both static and live-fetched paths
now converge on the same resolver output — and as a side effect, the dedup
check in _fetchLiveModels() now correctly identifies static entries as already
present, eliminating duplicate entries in the dropdown for Nous users.
Verified: all 29 Nous models in the browser dropdown carry @nous: prefix,
routing confirmed correct via resolve_model_provider() for all 4 static IDs,
1941 tests passing.
Closes#854.
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