* fix: detect env-var-configured providers absent from PROVIDER_REGISTRY
is_provider_explicitly_configured() only checked PROVIDER_REGISTRY (a
manually-maintained dict) for env-var names. Providers that exist solely
in the models.dev catalog — e.g. openrouter — were never recognised as
explicitly configured, so they were filtered out of the desktop model
picker even when their API key was set in .env.
Add a fallback to get_provider() (which reads the models.dev catalog)
when PROVIDER_REGISTRY returns None. Both ProviderConfig and ProviderDef
expose .auth_type and .api_key_env_vars with the same shape.
* test: keep OpenRouter provider gate assertion behavioral
* chore(release): map salvaged OpenRouter contributor
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Co-authored-by: zzpigpinggai <zzpigpinggai@users.noreply.github.com>
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