feat: fan model listing out across providers and route by id

A provider that is unreachable or whose filter matched nothing is
reported rather than fatal: local models must stay usable when the
network is down. Clients are built on demand so a key is resolved only
when that provider is really used.

The model listing carries its own timeout, separate from the per-turn
one: the picker has to populate fast, and a dead cloud provider must
not hang it for minutes. Client.models() takes list_timeout (default 30)
and uses httpx.Timeout(list_timeout, connect=5), and MultiClient threads
its own list_timeout through to each listing call. The fan-out stays
serial on purpose: KeyResolver._cache is unlocked and only safe while
every caller resolves on the GUI thread.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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